Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 33
Filtrar
Más filtros

Banco de datos
País/Región como asunto
Tipo del documento
Intervalo de año de publicación
1.
BJOG ; 129(4): 627-635, 2022 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-34532943

RESUMEN

OBJECTIVE: To examine the association between county-level caesarean delivery (CD) rates among women at low risk and morbidity among term newborns. DESIGN: Cross-sectional study. SETTING: Population-based study of US county-level birth data from 2015 to 2017. POPULATION: Nulliparous women with term, singleton, vertex-presenting infants (NTSV) at low risk for morbidity. METHODS: The primary exposure was county-level CD rates. MAIN OUTCOME MEASURES: The outcome was morbidity among the low-risk NTSV cohort, categorised as severe (5-minute Apgar score of ≤3, assisted ventilation for ≥6 hours, severe neurologic injury or seizure, transfer or death) or moderate (5-minute Apgar score of <7 but >3, administration of antibiotics or assisted ventilation at delivery). We used linear regression models to determine the association between county NTSV CD and neonatal morbidity rates with cluster robust standard errors. RESULTS: The analysis included data from 2 753 522 births in 952 counties from all 48 states. The mean NTSV CD rate was 23.6% (standard deviation 4.8%). The median severe and moderate neonatal morbidity rates were 15.2 (interquartile range, IQR 9.4-23.6) and 52.5 (IQR 33.4-75.7) per 1000 births, respectively. In the unadjusted analysis using the risk-adjusted exposure and outcome, every percentage point increase in the CD rate of a county was associated with 0.6 (95% CI -0.9, -0.3) and 2.3 fewer (95% CI -3.4, -1.1) cases of severe and moderate neonatal morbidity per 1000 live births. After adjustment for other county factors, the relationships remained significant. These findings were tested in multiple sensitivity analyses. CONCLUSIONS: Lower county-level NTSV CD rates were associated with a small increase in morbidity among term newborns in the USA. TWEETABLE ABSTRACT: Lower county-level caesarean delivery rates were associated with an increase in morbidity among term newborns in the USA.


Asunto(s)
Cesárea/estadística & datos numéricos , Resultado del Embarazo/epidemiología , Adulto , Cesárea/efectos adversos , Estudios Transversales , Femenino , Humanos , Lactante , Recién Nacido , Morbilidad , Embarazo , Nacimiento a Término , Estados Unidos/epidemiología
2.
J Med Entomol ; 47(2): 258-68, 2010 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-20380308

RESUMEN

The lone star tick, Amblyomma americanum (Acari: Ixodidae), is commonly reported from people and animals throughout the eastern U.S. and is associated with transmission of a number of emerging diseases. To better define the microbial communities within lone star ticks, 16S rRNA gene based analysis using bacteria-wide primers, followed by sequencing of individual clones (n = 449) was used to identify the most common bacterial operational taxonomic units (OTUs) present within colony-reared and wild A. americanum. The colony-reared ticks contained primarily sequence affiliated with members of the genus Coxiella (89%; 81/91), common endosymbionts of ticks, and Brevibacterium (11%; 10/91). Similarly, analysis of clones from unfed wild lone star ticks revealed that 96.7% (89/92) of all the OTUs identified were affiliated with Coxiella-like endosymbionts, as compared with only 5.1-11.7% (5/98-9/77) of those identified from wild lone star ticks after feeding. In contrast, the proportion of OTUs identified as Rickettsia sp. in wild-caught ticks increased from 2.2% (2/92) before feeding to as high as 46.8% (36/77) after feeding, and all Rickettsia spp. sequences recovered were most similar to those described from the spotted fever group Rickettsia, specifically R. amblyommii and R. massiliae. Additional characterization of the Rickettsiales tick community by polymerase chain reaction, cloning, and sequencing of 17 kDa and gltA genes confirmed these initial findings and suggested that novel Rickettsia spp. are likely present in these ticks. These data provide insight into the overall, as well as the rickettsial community of wild lone star ticks and may ultimately aid in identification of novel pathogens transmitted by A. americanum.


Asunto(s)
Ixodidae/microbiología , Rickettsia/clasificación , Rickettsia/aislamiento & purificación , Animales , Filogenia , ARN Bacteriano/clasificación , ARN Bacteriano/genética , ARN Ribosómico 16S/clasificación , ARN Ribosómico 16S/genética
3.
Open Forum Infect Dis ; 7(10): ofaa447, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-33134418

RESUMEN

Chronic granulomatous disease (CGD) is a primary immunodeficiency syndrome that results in increased risk for bacterial and fungal infections, as well as inflammatory/autoimmune complications. While CGD historically has been associated with early death in childhood, the life expectancy and morbidity of patients with CGD have greatly improved. Many patients with CGD now survive well into adulthood, and data on adult cohorts of patients with CGD have been published. However, reports of pregnancy management, complications, and outcomes for patients with CGD are sparse. In addition, management of invasive fungal infections, including use of newer triazole antifungals, during pregnancy has not been well described. We report a case of fungal lung infection in a pregnant woman with CGD, diagnosed during her second trimester, which was treated with multiple antifungal agents, including more than 12 weeks of isavuconazole therapy, resulting in resolution of infection and delivery of a healthy newborn at term.

4.
J Vet Intern Med ; 23(6): 1315-8, 2009.
Artículo en Inglés | MEDLINE | ID: mdl-19709355

RESUMEN

BACKGROUND: The range of American canine hepatozoonosis (ACH) is expanding from the southern USA northward. Transmission of Hepatozoon americanum occurs by ingestion of infected Gulf Coast ticks, Amblyomma maculatum. The source of the protozoan for the tick remains undetermined; infected dogs are unusual hosts for the tick. OBJECTIVE: Compare possible sources of infection by field investigations of 2 multiple-dog outbreaks of ACH. ANIMALS: Twenty-eight privately owned dogs (Canis familiaris), 1 coyote (Canis latrans), 31 wild-trapped cotton rats (Sigmodon hispidus), 24 wild-trapped field mice (Peromyscus leucopus), and 9 wild-caught rabbits (Sylvilagus spp.) from sites in eastern Oklahoma were monitored for hepatozoonosis. Six laboratory-raised cotton rats (S. hispidus), 6 Sprague-Dawley rats (Rattus norvegicus), 6 C57BL/6J-Lystbg-J/J mice (Mus musculus), 6 outbred white mice (M. musculus), 6 New Zealand white rabbits (Oryctolagus cuniculus), and 2 dogs were acquired through commercial vendors for experimental transmission trials of H. americanum. METHODS: Four of 15 dogs in a rural neighborhood and 5/12 hunting Beagles were confirmed to be infected by blood smear examination, muscle biopsy, and polymerase chain reaction assay of the 18S rRNA gene of Hepatozoon species. Histories and tick host preferences led to field collections of common prey of canids and experimental transmission trials of H. americanum to selected prey (M. musculus, S. hispidus, R. norvegicus, and O. cuniculus). RESULTS: Dogs with ready access to prey (4/15 dogs) or that were fed prey retrieved from hunts (5/12 hunting Beagles) became infected, providing evidence that predation is an important epidemiologic component of ACH infection. Experimental transmission studies identified a quiescent, infectious stage (cystozoite) of the parasite that provides an alternate mode of transmission to canids through predation, demonstrating that cotton rats, mice, and rabbits but not brown rats may act as paratenic hosts of H. americanum. CONCLUSIONS AND CLINICAL IMPORTANCE: Predation of prey harboring infected A. maculatum or containing cystozoites of H. americanum in their tissues provide 2 modes of transmission of ACH to dogs, putting unconfined dogs at increased risk of infection in endemic areas.


Asunto(s)
Coccidiosis/veterinaria , Brotes de Enfermedades/veterinaria , Enfermedades de los Perros/parasitología , Animales , Coccidios , Coccidiosis/epidemiología , Coccidiosis/transmisión , Enfermedades de los Perros/epidemiología , Enfermedades de los Perros/transmisión , Perros , Ratones , Conducta Predatoria , Conejos , Enfermedades por Picaduras de Garrapatas/veterinaria , Estados Unidos
5.
J Perinatol ; 37(4): 355-359, 2017 04.
Artículo en Inglés | MEDLINE | ID: mdl-28079871

RESUMEN

OBJECTIVE: This study seeks to determine if the increasing rate of postpartum readmissions is related to the increasing rate of cesarean delivery. STUDY DESIGN: Readmitted patients were identified in the State Inpatient Databases of California, Florida and New York from 2004 to 2011. Relevant maternal comorbidities, pregnancy complications and intrapartum events were collected using ICD-9 diagnosis and procedure codes. The effects of cesarean delivery were first examined via univariate logistic regression to calculate the odds of readmission by year for patients who had delivered via cesarean section. Then, we used multivariate logistic regression models to isolate the effect of mode of delivery on the odds of readmission by adjusting for the effects of patient demographics, hospital characteristics and maternal comorbidities. RESULTS: Nearly one million deliveries were identified each year, and ~600 000 deliveries per year met inclusion criteria. During this time, the readmission rate increased from 1.72 to 2.16%, and the cesarean delivery rate increased from 30.4 to 33.9%. The odds of readmission for patients delivered via cesarean section decreased yearly, from 1.343 (95% CI: 1.295 to 1.392) in 2004 to 1.046 (95% CI: 1.012 to 1.108) in 2011. In a multivariate model, the odds based on year were 1.032 (95% CI: 1.030 to 1.035), demonstrating an increased odds of readmission over time. When cesarean delivery was added to the model, this odds estimate did not change (OR: 1.031, 95% CI: 1.028 to 1.035), suggesting it did not account for the increased odds of readmission over time, even though cesarean delivery rates increased. However, when maternal comorbidities were added to the model, the odds ratio for year became insignificant (OR: 1.001, 95% CI: 0.998 to 1.005), suggesting that they accounted for the increasing rate of readmissions. CONCLUSIONS: The increasing cesarean delivery rate does not explain the increasing rate of postpartum readmissions. Rather, the increasing postpartum readmission rate appears to be related to maternal comorbidities.


Asunto(s)
Cesárea/estadística & datos numéricos , Cesárea/tendencias , Readmisión del Paciente/estadística & datos numéricos , Readmisión del Paciente/tendencias , Adulto , Comorbilidad , Femenino , Humanos , Clasificación Internacional de Enfermedades , Modelos Logísticos , Análisis Multivariante , Oportunidad Relativa , Periodo Posparto , Embarazo , Factores Socioeconómicos , Estados Unidos/epidemiología , Adulto Joven
6.
Vet Microbiol ; 115(1-3): 229-36, 2006 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-16459029

RESUMEN

Borrelia lonestari is considered a putative agent of southern tick-associated rash illness (STARI) and is known to occur naturally only in lone star ticks (Amblyomma americanum) and white-tailed deer (Odocoileus virginianus). We used a low passage isolate of B. lonestari (LS-1) to inoculate white-tailed deer, C3H mice, Holstein cattle, and beagles. Animals were monitored via examination of Giemsa and acridine orange stained blood smears, polymerase chain reaction (PCR), indirect fluorescent antibody (IFA) test, and/or culture isolation. Spirochetes were visualized in blood smears of both deer on days post-inoculation (DPI) 6, 8, 12 and one deer on DPI 15. Whole blood collected from deer tested PCR positive starting on DPI 4 and remained positive as long as DPI 28. Both deer developed antibody titers of >64, with a maximum IFA titer of 1024. The organism was reisolated from the blood of both deer on DPI 6 and one deer on DPI 12. All isolation attempts from mice, calves, or dogs were negative, although one of seven mice was transiently PCR positive. Mice and dogs developed an IFA titer > or =64, while calves lacked a detectable antibody response. These preliminary experimental infection trials show that white-tailed deer are susceptible to infection with B. lonestari and develop a spirochetemia following needle-inoculation, while C3H mice, calves, and dogs do not. Results suggest that deer may serve as a vertebrate reservoir host. Tick transmission studies are needed to confirm that this organism can be maintained in a natural cycle involving deer and A. americanum.


Asunto(s)
Vectores Arácnidos/microbiología , Bacteriemia/veterinaria , Borrelia/patogenicidad , Ciervos/microbiología , Enfermedad de Lyme/veterinaria , Garrapatas/microbiología , Animales , Anticuerpos Antibacterianos/sangre , Bacteriemia/microbiología , Borrelia/genética , Borrelia/inmunología , Bovinos , ADN Bacteriano/sangre , Ciervos/sangre , Reservorios de Enfermedades/veterinaria , Perros , Femenino , Enfermedad de Lyme/microbiología , Enfermedad de Lyme/transmisión , Masculino , Ratones , Ratones Endogámicos C3H , Especificidad de la Especie , Factores de Tiempo
7.
J Perinatol ; 36(5): 357-61, 2016 05.
Artículo en Inglés | MEDLINE | ID: mdl-26765557

RESUMEN

OBJECTIVE: Few characteristics have been identified as risk factors for brachial plexus injuries. We sought to investigate a potential relationship with multiparity based on clinical observation at our institution. STUDY DESIGN: In this retrospective case series, we analyzed all brachial plexus injuries recognized at or after delivery between October 2003 and March 2013 (n=78) at a single academic medical institution. Patient, infant, labor and delivery characteristics were compared for women with and without prior vaginal deliveries. RESULT: Of the 78 injuries, 71 (91%) occurred after a vaginal delivery and 7 (9%) after a cesarean delivery. Of the 71 injuries after a vaginal delivery, 58% occurred in women with a prior vaginal delivery (n=41, 5.7 per 10 000 live births) compared with 42% without a prior vaginal delivery (n=30, 4.0 per 10 000 live births). Multiparous patients had shorter labor courses and fewer labor interventions than nulliparous patients. Providers clinically underestimated the birth weights to a greater extent in multiparas than in nulliparas (median underestimation 590 vs 139 g, P=0.0016). The median birth weight was 4060 g in the multiparous group, which was significantly larger than affected infants born to the nulliparous group (3591 g, P=0.006). The affected infants of the multiparous group were, as expected, significantly larger than their previously born siblings (median 567 g larger, P<0.001). CONCLUSION: Brachial plexus injuries occurred as frequently in multiparous patients as in nulliparous patients. In general, multiparous patients are more likely to have larger infants; however, providers significantly underestimate the birth weight of their infants. The findings of this study should deter providers from assuming that a prior vaginal delivery is protective against brachial plexus injuries.


Asunto(s)
Traumatismos del Nacimiento , Peso al Nacer/fisiología , Plexo Braquial/lesiones , Cesárea , Parto Obstétrico , Paridad/fisiología , Parto Vaginal Después de Cesárea , Adulto , Traumatismos del Nacimiento/epidemiología , Traumatismos del Nacimiento/etiología , Traumatismos del Nacimiento/fisiopatología , Traumatismos del Nacimiento/prevención & control , Cesárea/métodos , Cesárea/estadística & datos numéricos , Parto Obstétrico/métodos , Parto Obstétrico/estadística & datos numéricos , Femenino , Humanos , Recién Nacido , Embarazo , Estudios Retrospectivos , Factores de Riesgo , Estadística como Asunto , Estados Unidos/epidemiología , Parto Vaginal Después de Cesárea/métodos , Parto Vaginal Después de Cesárea/estadística & datos numéricos
8.
J Perinatol ; 35(12): 1006-10, 2015 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-26491851

RESUMEN

OBJECTIVE: To evaluate whether second trimester pregnancy termination with dilation and evacuation (D&E) vs induction of labor (IOL) affects subsequent risk of preterm birth. STUDY DESIGN: Our cohort was a retrospective cohort of women undergoing second trimester pregnancy termination for fetal anomalies, fetal death or previable premature rupture of membranes. We analyzed the rates of spontaneous delivery <37 weeks in the first pregnancy following the termination. We also compared preterm birth rates in our cohort with national averages and analyzed by the total number of prior procedures. RESULT: There were 173 women in our cohort. Women who had undergone a D&E (n=130) were less likely to have a subsequent preterm birth (6.9 vs 30.2%; P<0.01). This held true for a low risk subset without obstetric risk factors. There was no statistical difference in preterm birth rates for women who had undergone a D&E as compared with national averages, nor between the rates of preterm birth for women with 0, 1, 2 or 3 or more prior first or second trimester procedures. CONCLUSION: We did not find that D&E was a risk factor for preterm delivery when compared with women with a prior IOL or national rates.


Asunto(s)
Aborto Inducido/efectos adversos , Aborto Inducido/métodos , Complicaciones del Embarazo , Segundo Trimestre del Embarazo , Nacimiento Prematuro/epidemiología , Adulto , Femenino , Muerte Fetal , Rotura Prematura de Membranas Fetales , Edad Gestacional , Humanos , Recién Nacido , Embarazo , Estudios Retrospectivos , Factores de Riesgo
9.
J Vet Intern Med ; 29(2): 552-5, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-25776536

RESUMEN

BACKGROUND: Ehrlichia ewingii, which causes disease in dogs and people, is the most common Ehrlichia spp. infecting dogs in the United States, but little is known about how long E. ewingii infection persists in dogs. HYPOTHESIS/OBJECTIVES: To evaluate the persistence of natural infection with E. ewingii in dogs. ANIMALS: Four Class A Beagles; no previous exposure to ticks or tick-borne infectious agents. METHODS: Dogs were exposed to ticks by weekly walks through tick habitat in north central Oklahoma; dogs positive for infection with Ehrlichia spp. by sequence-confirmed PCR and peptide-specific serology were evaluated for 733 days (D). Whole blood was collected once weekly for PCR, and serum was collected once monthly for detection of antibodies to Ehrlichia canis (peptide p16), Ehrlichia chaffeensis (indirect fluorescence antibody [IFA] and variable-length PCR target [VLPT]), and E. ewingii (peptide p28). RESULTS: All dogs (4/4) became infected with Ehrlichia spp. as evidenced by seroconversion on IFA to E. chaffeensis (4/4); PCR detection of E. ewingii (4/4) and E. chaffeensis (2/4) DNA using both nested and real-time assays; and presence of specific antibodies to E. ewingii (4/4) and E. chaffeensis (2/4). Infection with E. chaffeensis was not detected after D55. Intermittent E. ewingii rickettsemia persisted in 3 of 4 dogs for as long as 733 days. CONCLUSIONS AND CLINICAL IMPORTANCE: Our data demonstrate that dogs infected with E. ewingii from tick feeding are capable of maintaining infection with this pathogen long-term, and may serve as a reservoir host for the maintenance of E. ewingii in nature.


Asunto(s)
Enfermedades de los Perros/microbiología , Ehrlichia/inmunología , Ehrlichiosis/veterinaria , Infestaciones por Garrapatas/veterinaria , Animales , Anticuerpos Antibacterianos , Enfermedades de los Perros/sangre , Enfermedades de los Perros/etiología , Perros , Ehrlichia chaffeensis/inmunología , Ehrlichiosis/microbiología , Técnica del Anticuerpo Fluorescente Indirecta , Reacción en Cadena de la Polimerasa/métodos , Infestaciones por Garrapatas/sangre , Infestaciones por Garrapatas/complicaciones
10.
J Med Entomol ; 41(4): 753-9, 2004 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-15311471

RESUMEN

Amblyomma americanum (lone star tick) is known or suspected to vector several organisms that are implicated as human pathogens, including Ehrlichia chaffeensis, E. ewingii, and Borrelia lonestari. These three agents have also been detected in white-tailed deer (Odocoileus virginianus). Because northeastern Georgia has a high abundance of both lone star ticks and white-tailed deer, and one of these organisms, E. chaffeensis, is already known to be endemic in the area, we assayed individual adult A. americanum, collected during the spring of 2001, 2002, and 2003, for these three organisms. A total of 400 ticks were dissected and tissues assayed by polymerase chain reaction (PCR) using Ehrlichia species-specific and Borrelia genus-wide primers. Of ticks tested, 2.0% (8/398) had evidence of E. chaffeensis, 4.8% (19/398) had evidence of E. ewingii, and 1.0% (4/398) had evidence of B. lonestari. Borrelia sp. spirochetes were also visualized by an indirect fluorescent antibody test, using an anti-flagellin monoclonal antibody (H9724), in a total of 10.7% (32/300) of ticks tested in 2003. These results reconfirm the presence of E. chaffeensis and establish evidence of E. ewingii and B. lonestari in questing adult A. americanum ticks from northeastern Georgia. Detection of at least two of the three organisms in ticks collected each year suggests that people in northeastern Georgia are at risk of infection with these organisms.


Asunto(s)
Infecciones Bacterianas/transmisión , Borrelia/aislamiento & purificación , Ehrlichia/aislamiento & purificación , Ixodidae/microbiología , Animales , Infecciones Bacterianas/veterinaria , Borrelia/genética , ADN Bacteriano/genética , ADN Bacteriano/aislamiento & purificación , Bases de Datos de Ácidos Nucleicos , Ciervos , Ehrlichia/genética , Flagelina/genética , Georgia , Humanos , Reacción en Cadena de la Polimerasa/métodos , Estaciones del Año
11.
J Med Entomol ; 36(2): 190-4, 1999 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-10083757

RESUMEN

Polymerase chain reaction (PCR) evidence of a novel Ehrlichia organism was found recently in wild white-tailed deer, Odocoileus virginianus Zimmermann, and lone star ticks, Amblyomma americanum L., from the southeastern United States. To evaluate whether lone star tick parasitism was associated with the presence of this novel Ehrlichia organism in deer, 2 retrospective studies were conducted using specific nested PCR to test archived deer serum samples. The 1st study of 150 serum samples collected from a single deer population over a 15-yr period examined the temporal association between the presence of the Ehrlichia organism in deer and parasitism by lone star ticks. The deer Ehrlichia was not detected in serum samples collected before 1986, when lone star ticks were absent or rare, but was detected in samples collected in 1986 and every year thereafter, when lone star ticks became increasingly abundant. In the 2nd study, serum samples from 120 deer from 24 sites in 14 southeastern states were tested to evaluate if a site-specific, spatial association existed between the presence of the deer Ehrlichia and lone star ticks. All 60 serum samples from the 12 deer populations without evidence of lone star tick infestation were negative for the deer Ehrlichia, whereas 83% of the 12 populations infested by lone star ticks had PCR evidence of infection. These data suggest that lone star ticks may be a vector of the deer Ehrlichia; however, they do not preclude the involvement of other arthropods in maintaining infection with this organism in deer populations.


Asunto(s)
Vectores Arácnidos/microbiología , Ciervos/microbiología , Ehrlichia , Ehrlichiosis/veterinaria , Garrapatas/microbiología , Animales , Ehrlichia/clasificación , Ehrlichia/genética , Ehrlichiosis/microbiología
12.
Vet Parasitol ; 97(2): 159-64, 2001 May 22.
Artículo en Inglés | MEDLINE | ID: mdl-11358632

RESUMEN

Little is known about the epidemiology of Neospora caninum in wild mammal populations. It has been suggested that a sylvatic cycle exists for N. caninum. Dogs and potentially other canids are a definitive host for N. caninum. The present study was done to determine the prevalence of antibodies to N. caninum in a population of gray foxes (Urocyon cinereoargenteus) from a nonagricultural setting in South Carolina. We also determined the prevalence of antibodies to Toxoplasma gondii in these animals. Antibody levels were measured in direct agglutination tests using either N. caninum or T. gondii formalin-fixed tachyzoites as antigen. Four (15.4%) of the 26 gray foxes had titers to N. caninum. Titers to N. caninum were low being 1:25 in three gray foxes and 1:50 in the fourth gray fox. Antibodies to T. gondii were observed in 16 (61.5%) gray foxes. Titers to T. gondii were usually >1:50 and two gray foxes had titers of 1:1600. Results of this study indicate that gray foxes have more exposure to T. gondii than to N. caninum in this environment.


Asunto(s)
Anticuerpos Antiprotozoarios/análisis , Zorros/parasitología , Neospora/inmunología , Toxoplasma/inmunología , Factores de Edad , Pruebas de Aglutinación/veterinaria , Animales , Femenino , Masculino , South Carolina
13.
J Parasitol ; 88(2): 415-7, 2002 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-12054027

RESUMEN

Serum samples from 305 white-tailed deer (Odocoileus virginianus) from 14 states in the southeastern United States were examined for antibodies to Neospora caninum using a direct agglutination test. Positive agglutination titers were found in 145 (48%) of the white-tailed deer examined: 21 (7%) had titers of 1:25, 92 (30%) had titers of 1:50, and 32 (10%) had titers of > or = 1:500. These findings that antibodies to N. caninum are common in white-tailed deer support the concept that a sylvatic cycle might exist for this economically important parasite of domestic cattle.


Asunto(s)
Anticuerpos Antiprotozoarios/sangre , Coccidiosis/veterinaria , Ciervos/inmunología , Ciervos/parasitología , Neospora/inmunología , Pruebas de Aglutinación/veterinaria , Animales , Coccidiosis/epidemiología , Coccidiosis/inmunología , Coccidiosis/parasitología , Estudios Seroepidemiológicos , Sudeste de Estados Unidos/epidemiología
14.
J Parasitol ; 84(5): 897-901, 1998 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-9794627

RESUMEN

The ticks Amblyomma americanum and Ixodes scapularis, strongly implicated vectors of Ehrlichia chaffeensis and the human granulocytic ehrlichiosis (HGE) agent, respectively, commonly are found on white-tailed deer (Odocoileus virginianus). As deer can be infected with E. chaffeensis, the HGE agent, and another Ehrlichia-like organism, a deer population parasitized by both tick species in coastal Georgia was tested for evidence of Ehrlichia spp. infection using serologic, molecular, and culture techniques. Antibodies to both E. chaffeensis (geometric mean titer = 111) and Ehrlichia equi, surrogate antigen for the HGE agent, (geometric mean titer = 1,024) were detected by indirect fluorescent antibody testing. Nested polymerase chain reaction employing species-specific primers demonstrated sequence-confirmed 16S rDNA fragments of 3 distinct Ehrlichia spp. in this population: E. chaffeensis (1/5), the HGE agent (3/5), and an Ehrlichia-like organism previously described from white-tailed deer (5/5). Ehrlichia chaffeensis was isolated in culture from the inguinal lymph node of a single deer. An Ehrlichia-type morula was identified in a neutrophil of 1 deer on examination of blood smears. This work provides the first evidence of the HGE agent in a nonhuman host in the southeastern United States and documents infection with both E. chaffeensis and the HGE agent in a single deer population, thereby supporting the importance of white-tailed deer in the natural history of the human ehrlichioses agents.


Asunto(s)
Ciervos , Ehrlichia/aislamiento & purificación , Ehrlichiosis/veterinaria , Animales , Anticuerpos Antibacterianos/sangre , Bacteriemia/microbiología , Bacteriemia/veterinaria , ADN Ribosómico/análisis , ADN Ribosómico/sangre , Ciervos/parasitología , Ehrlichia/clasificación , Ehrlichia/inmunología , Ehrlichiosis/microbiología , Técnica del Anticuerpo Fluorescente Indirecta/veterinaria , Ixodes/clasificación , Ganglios Linfáticos/microbiología , Músculo Esquelético/microbiología , Neutrófilos/microbiología , Reacción en Cadena de la Polimerasa/veterinaria , Bazo/microbiología , Infestaciones por Garrapatas/parasitología , Infestaciones por Garrapatas/veterinaria , Garrapatas/clasificación
15.
J Parasitol ; 84(3): 661-3, 1998 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-9645885

RESUMEN

A Sarcocystis-like organism was associated with encephalitis and myocarditis in an ataxic, emaciated adult male turkey (Meleagris gallopavo) from Gilmer County, West Virginia. Protozoal schizonts and merozoites were associated with areas of inflammation and occasionally necrosis in both the heart and the brain. The organisms divided by endopolygeny and stained positively with anti-Sarcocystis cruzi serum in an immunohistochemical test.


Asunto(s)
Enfermedades de las Aves/parasitología , Encefalitis/veterinaria , Miocarditis/veterinaria , Sarcocistosis/veterinaria , Pavos/parasitología , Animales , Animales Salvajes , Enfermedades de las Aves/patología , Encéfalo/parasitología , Encéfalo/patología , Encefalitis/parasitología , Encefalitis/patología , Corazón/parasitología , Sueros Inmunes/inmunología , Inmunohistoquímica , Masculino , Músculo Esquelético/parasitología , Miocarditis/parasitología , Miocarditis/patología , Miocardio/patología , Necrosis , Sarcocystis/inmunología , Sarcocystis/aislamiento & purificación , Sarcocistosis/parasitología , Sarcocistosis/patología
16.
J Parasitol ; 83(5): 887-94, 1997 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-9379294

RESUMEN

The roles of wild mammals and ticks in the epidemiology of Ehrlichia chaffeensis at a suspected endemic site were investigated using serologic testing, culture, and polymerase chain reaction (PCR) supported by restriction endonuclease analysis and DNA sequencing. Antibodies reactive to E. chaffeensis (> or = 1:64) were detected in 92% of white-tailed deer (Odocoileus virginianus), 21% of raccoons (Procyon lotor), and 8% of opossums (Didelphis virginianus), but not in 8 other species of mammals. Of 7 species of ticks found by host and environmental sampling, Amblyomma americanum was the dominant species, accounting for greater than 99% of all ticks collected. Deer, raccoons, and opossums were the only species parasitized by all life stages of A. americanum, and A. americanum was the only tick parasitizing deer. A nested PCR protocol incorporating E. chaffeensis-specific primers detected E. chaffeensis DNA in blood, lymph nodes, or spleen from 54% of deer examined. The nested PCR detected E. chaffeensis DNA in 6 of 50 (12%) individual adult A. americanum collected from the environment, in 14 of 79 (18%) pools representing 402 adult A. americanum collected from the environment, and in 7 of 25 (28%) pools of mixed stages of A. americanum collected from deer. Although no Ehrlichia spp. were isolated in culture, sequencing of representative amplicons from deer and ticks confirmed PCR products as E. chaffeensis. These data provide strong evidence that white-tailed deer and lone star ticks are the primary reservoir and vector of E. chaffeensis, respectively. The same PCR protocol, incorporating primers specific for an Ehrlichia-like organism of white-tailed deer, detected this organism in blood, lymph nodes, or spleen from 96% of these deer. The Ehrlichia-like organism of deer was detected by PCR from 0 of 50 individual ticks, 7 of 79 (9%) pools, and 1 of 25 (4%) pools of A. americanum collected from deer. Sequencing of representative amplicons from deer and ticks confirmed PCR products as Ehrlichia-like organism of deer. These data suggest that the Ehrlichia-like organism of deer is present in both the deer and lone star ticks populations at this location.


Asunto(s)
Animales Salvajes , Ehrlichia chaffeensis , Ehrlichiosis/veterinaria , Animales , Anticuerpos Antibacterianos/sangre , Vectores Arácnidos/microbiología , ADN Bacteriano/análisis , Ciervos , Reservorios de Enfermedades , Ehrlichia chaffeensis/genética , Ehrlichia chaffeensis/inmunología , Ehrlichiosis/epidemiología , Georgia/epidemiología , Muridae , Zarigüeyas , Peromyscus , Reacción en Cadena de la Polimerasa/veterinaria , Prevalencia , Conejos , Mapaches , Mapeo Restrictivo , Sciuridae , Sigmodontinae , Infestaciones por Garrapatas/epidemiología , Infestaciones por Garrapatas/veterinaria , Garrapatas/microbiología
17.
J Wildl Dis ; 35(3): 596-9, 1999 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-10479099

RESUMEN

White-tailed deer (Odocoileus virginianus) play an integral role in the natural history of Ehrlichia chaffeensis, the causative agent of human monocytic ehrlichiosis (HME). Paraffinized tissues from a white-tailed deer submitted as a diagnostic case to the Southeastern Cooperative Wildlife Disease Study (Athens, Georgia, USA) in October of 198.5 and originally described as infected with an unidentified rickettsial organisim were re-examined by specific nested polymerase chain reaction (PCR) for evidence of infection with Ehrlichia spp. Ehrlichia chaffeensis was identified from the bone marrow and inguinal lymph node of this deer based on amplification of a characteristic sequence-confirmed 16S rDNA fragment from these tissues. Parallel PCR tests on the same samples were negative for 16S rDNA fragments of the agent of human granulocytic ehrlichiosis (HGE) and for an Ehrlichia-like organism widely distributed in white-tailed deer populations. This report describes detection of E. chaffeensis in archived tissue from a deer collected before the index case of human monocytic ehrlichiosis was established.


Asunto(s)
Ciervos , Ehrlichia chaffeensis/aislamiento & purificación , Ehrlichiosis/veterinaria , Animales , Médula Ósea/microbiología , ADN Bacteriano/análisis , ADN Bacteriano/química , ADN Ribosómico/análisis , ADN Ribosómico/química , Reservorios de Enfermedades/veterinaria , Ehrlichia chaffeensis/genética , Ehrlichiosis/microbiología , Georgia , Ganglios Linfáticos/microbiología , Masculino , Reacción en Cadena de la Polimerasa/veterinaria , ARN Ribosómico 16S/genética , Estudios Retrospectivos , Análisis de Secuencia de ADN/veterinaria , Bazo/microbiología
18.
J Wildl Dis ; 33(4): 873-6, 1997 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-9391974

RESUMEN

A striped skunk (Mephitis mephitis) from Kansas (USA) with severe diffuse dermatitis characterized by extensive alopecic areas, thickened skin, and multiple, scattered cutaneous abscesses on the dorsal aspect of the head, neck, and trunk was submitted for diagnostic evaluation. More than 50 nematodes identified as Filaria taxideae were found in the dorsal subcutaneous tissue. Histologic examination of the skin revealed multifocal pyogranulomatous inflammation with intralesional larvated nematode eggs, moderate orthokeratotic hyperkeratosis, and mild acanthosis. The lesions resemble those reported from badgers (Taxidea taxus) and a lesser panda (Ailurus fulgens) with dermatitis caused by Filaria taxideae. Although F. taxideae has been previously collected from skunks, this is the first report of filarid dermatitis caused by this nematode in a striped skunk.


Asunto(s)
Alopecia/veterinaria , Dermatitis/veterinaria , Filariasis/veterinaria , Mephitidae/parasitología , Enfermedades Cutáneas Parasitarias/veterinaria , Alopecia/parasitología , Alopecia/patología , Animales , Dermatitis/parasitología , Dermatitis/patología , Filariasis/parasitología , Filariasis/patología , Filarioidea/aislamiento & purificación , Masculino , Piel/parasitología , Piel/patología , Enfermedades Cutáneas Parasitarias/parasitología , Enfermedades Cutáneas Parasitarias/patología
19.
J Wildl Dis ; 34(3): 625-8, 1998 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-9706574

RESUMEN

An emaciated, moribund, male blue jay (Cyanocitta cristata) was collected in Georgia (USA) and died shortly after capture. Necropsy revealed nine large nematodes identified as Diplotriaena tricuspis in the thoracic and abdominal air sacs and within the pericardial sac. Multiple mycotic granulomas also were observed in the lungs and air sacs, and fungal culture of these lesions yielded pure growth of Aspergillus fumigatus. Histologic examination of the lungs revealed disseminated granulomatous inflammation containing both larvated nematode eggs and abundant fungal hyphae. This is the first description of concomitant A. fumigatus and D. tricuspis infection in a bird.


Asunto(s)
Aspergilosis/veterinaria , Enfermedades de las Aves , Enfermedades Pulmonares Fúngicas/veterinaria , Enfermedades Pulmonares Parasitarias/veterinaria , Infecciones por Nematodos/veterinaria , Neumonía/veterinaria , Sacos Aéreos/microbiología , Sacos Aéreos/parasitología , Sacos Aéreos/patología , Animales , Aspergilosis/complicaciones , Aspergilosis/microbiología , Enfermedades de las Aves/microbiología , Enfermedades de las Aves/parasitología , Enfermedades de las Aves/patología , Aves , Resultado Fatal , Georgia , Pulmón/microbiología , Pulmón/parasitología , Pulmón/patología , Enfermedades Pulmonares Fúngicas/complicaciones , Enfermedades Pulmonares Fúngicas/microbiología , Enfermedades Pulmonares Parasitarias/complicaciones , Enfermedades Pulmonares Parasitarias/parasitología , Masculino , Infecciones por Nematodos/complicaciones , Infecciones por Nematodos/parasitología , Neumonía/microbiología , Neumonía/parasitología
20.
J Wildl Dis ; 34(3): 620-4, 1998 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-9706573

RESUMEN

Diagnostic findings on 51 red foxes (Vulpes vulpes) from the southeastern United States examined from 1967 to 1995 were reviewed. Etiologic diagnoses included sarcoptic manage (n = 33), traumatic injury and associated complications (n = 5), suspected canine distemper (n = 2), capture myopathy (n = 1), congenital absence of guard hairs (n = 1), intradermal tick infestation (n = 1), otodectic manage (n = 1), and toxicosis (n = 1). The cause of morbidity was not determined for three of the foxes, and three others were classified as normal animals. Sarcoptic manage was diagnosed in 65% of the red foxes, was found in foxes submitted from four of the eight southeastern states represented, and was seen in 19 of 29 yr covered by this study.


Asunto(s)
Zorros , Escabiosis/veterinaria , Alopecia/congénito , Alopecia/epidemiología , Alopecia/veterinaria , Animales , Autopsia/veterinaria , Moquillo/epidemiología , Femenino , Zorros/lesiones , Masculino , Infestaciones por Ácaros/epidemiología , Infestaciones por Ácaros/veterinaria , Morbilidad , Enfermedades Musculares/epidemiología , Enfermedades Musculares/veterinaria , Intoxicación/epidemiología , Intoxicación/veterinaria , Venenos , Prevalencia , Escabiosis/epidemiología , Estaciones del Año , Sudeste de Estados Unidos/epidemiología , Estricnina/envenenamiento , Infestaciones por Garrapatas/epidemiología , Infestaciones por Garrapatas/veterinaria , Toxoplasmosis Animal/epidemiología , Heridas y Lesiones/epidemiología , Heridas y Lesiones/veterinaria
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA