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1.
Med Trop Sante Int ; 4(1)2024 Mar 31.
Artículo en Francés | MEDLINE | ID: mdl-38846122

RESUMEN

Objective: To determine the etiology of cervico-vaginal infections by cytobacteriology and the efficacy of qPCR for the diagnosis of sensitive strains such as Streptococcus agalactiae, Borrelia crocidurae, Chlamydia trachomatis, Neisseria gonorrhoeae and Treponema pallidum. Methodology: This prospective cross-sectional study was performed between January and September 2021 in 346 women who were examined for cervico-vaginal infection at the Hôpital Principal de Dakar (HPD). Cytobacteriological (direct examination, agar culture) and molecular analyses were performed. Results: Vaginal flora imbalances predominated, with a rate of 72.3%. The proportion of type IV vaginal flora was 46.5%. Of the 199 germs isolated, Candida albicans (25.1%), Ureaplasma urealyticum (17.6%), S. agalactiae (7.8%), Gardnerella vaginalis (6.6%) and nonalbicans Candida (5.5%) were the main pathogens responsible for cervico-vaginal infections in patients. Among women tested for mycoplasma, U. urealyticum was identified in 43.3% of patients. Among those tested for C. trachomatis, the proportion of infected women was low (4%). The prevalence of C. albicans was higher in pregnant women (38.3%) than in nonpregnant women (19.2%). S. agalactiae strains showed high resistance to certain beta-lactam antibiotics (pristinamycin 100%, gentamycin 100%, ampicillin 92.5% and cefalotin 85.2%) and to a glycopeptide antibiotic (vancomycin 100%). The Staphylococcus aureus strain had good sensitivity to antibiotics except gentamycin (100%) and kanamycin (100%). The enterobacteria tested were all sensitive to phenicols, carbapenems, cephalosporins and aminoglycosides. However, E. coli showed high resistance to tetracycline. The different methods showed low prevalences of C. trachomatis and N. gonorrhoeae, so comparisons Test RapidChlamydia/qPCR for C. trachomatis and culture/qPCR for N. gonorrhoeae were not possible. For S. agalactiae, on the other hand, qPCR was more advantageous than culture. The χ2 test showed a significant difference (Yates χ2 = 33.77 and p = 1-7) for the diagnosis of S. agalactiae. S. agalactiae qPCR had a sensitivity of 40.7%, a specificity of 94%, and positive and negative predictive values of 36.7% and 94.9% respectively, as well as a kappa = 0.33. Conclusion: The methods applied enabled us to identify the pathogens that cause cervicovaginal infections. The results suggest that qPCR may be an alternative, at least for the diagnosis of S. agalactiae. However, culture remains indispensable for studying antibiotic sensitivity. In order to improve patient care, molecular techniques need to be integrated into the HPD testing toolbox. To broaden the repertoire of pathogens to be diagnosed by qPCR, targeted comparison studies will be needed to increase the probability of encountering infected individuals.


Asunto(s)
Reacción en Cadena en Tiempo Real de la Polimerasa , Humanos , Femenino , Senegal/epidemiología , Estudios Transversales , Adulto , Estudios Prospectivos , Adulto Joven , Reacción en Cadena en Tiempo Real de la Polimerasa/métodos , Persona de Mediana Edad , Adolescente , Vaginitis/microbiología , Vaginitis/epidemiología , Vaginitis/diagnóstico , Vaginitis/tratamiento farmacológico
2.
Front Epidemiol ; 4: 1309149, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38577653

RESUMEN

Background: With growing use of parasitological tests to detect malaria and decreasing incidence of the disease in Africa; it becomes necessary to increase the understanding of causes of non-malaria acute febrile illness (NMAFI) towards providing appropriate case management. This research investigates causes of NMAFI in pediatric out-patients in rural Guinea-Bissau. Methods: Children 0-5 years presenting acute fever (≥38°) or history of fever, negative malaria rapid diagnostic test (mRDT) and no signs of specific disease were recruited at the out-patient clinic of 3 health facilities in Bafatá province during 54 consecutive weeks (dry and rainy season). Medical history was recorded and blood, nasopharyngeal, stool and urine samples were collected and tested for the presence of 38 different potential aetiological causes of fever. Results: Samples from 741 children were analysed, the protocol was successful in determining a probable aetiological cause of acute fever in 544 (73.61%) cases. Respiratory viruses were the most frequently identified pathogens, present in the nasopharynx samples of 435 (58.86%) cases, followed by bacteria detected in 167 (22.60%) samples. Despite presenting negative mRDTs, P. falciparum was identified in samples of 24 (3.25%) patients. Conclusions: This research provides a description of the aetiological causes of NMAFI in West African context. Evidence of viral infections were more commonly found than bacteria or parasites.

3.
Int J Infect Dis ; 141: 106952, 2024 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-38336005

RESUMEN

OBJECTIVES: Influenza is frequent among pilgrims participating in the Grand Magal de Touba (GMT), in Senegal, with a potential to spread to contacts when they return home. METHODS: Ill pilgrims consulting at a health care center in Mbacké city close to Touba during the 2021 GMT, pilgrims returning to Dielmo and Ndiop villages, and patients who did not travel to Touba and consulted at health care centers in these two villages in 2021 were tested for the influenza virus by polymerase chain reaction on nasopharyngeal samples. Next-generation sequencing and comparative and phylogenetic analyses of influenza A virus genomes were performed. RESULTS: A total of 62 of 685 patients tested positive for influenza A virus, including 34 of 53 who were consulted in Mbacké in late September, six of 129 pilgrims who returned home in early October, and 20 of 42 villagers from October 3 to 29. A total of 27 genomes were obtained. Four clusters were observed based on the phylogenetic analyses, suggesting that Mbacké patients and returned pilgrims may have shared closely related viral strains with patients inhabiting the villages who did not participate in the GMT. CONCLUSIONS: Villagers in Ndiop and Dielmo may have been infected with viral strains originating from the GMT and possibly imported by pilgrims who returned from the GMT.


Asunto(s)
Gripe Humana , Humanos , Gripe Humana/epidemiología , Senegal/epidemiología , Filogenia , Estudios Epidemiológicos , Reacción en Cadena en Tiempo Real de la Polimerasa , Genómica
4.
Artículo en Inglés | MEDLINE | ID: mdl-37578895

RESUMEN

Bartonella species are involved in various human diseases, causing a range of clinical manifestations; animals are considered as the main reservoirs, transmitting diverse species of Bartonella through direct contact and haematophagous insects. Here, we characterize a new species, Bartonella raoultii sp. nov., within the genus Bartonella, using a taxonogenomic polyphasic approach. Strain 094T (= CSUR B1097T=DSM 28004T), isolated from the blood of an infected rodent (Mastomys erythroleucus) in Senegal, is an aerobic and rod-shaped bacterium. The annotated non-contiguous genome sequence is 1 952322 bp long and contains 37.2 mol% G+C content, 1686 protein-coding genes and 50 RNA genes, including seven rRNA genes.


Asunto(s)
Bartonella , Animales , Humanos , Senegal , Composición de Base , ARN Ribosómico 16S/genética , ADN Bacteriano/genética , Filogenia , Análisis de Secuencia de ADN , Técnicas de Tipificación Bacteriana , Ácidos Grasos/química , Murinae/genética
7.
Travel Med Infect Dis ; 52: 102515, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-36470351

RESUMEN

BACKGROUND: Respiratory and gastrointestinal symptoms and febrile illness are the most common complaints among ill pilgrims attending the Grand Magal of Touba (GMT) in Senegal. METHODS: Patients presenting with respiratory or gastrointestinal symptoms or febrile systemic illnesses were recruited between 2018 and 2021 at a healthcare centre close to Touba. Respiratory, gastrointestinal and blood samples were tested for potential pathogens using qPCR. RESULTS: 538 patients were included. 45.5% of these were female, with a median age of 17 years. Of the 326 samples collected from patients with a cough, 62.8% tested positive for at least one virus, including influenza viruses (33.1%). A high positivity rate of bacterial carriage was observed for Haemophilus influenzae (72.7%), Streptococcus pneumoniae (51.2%) and Moraxella catarrhalis (46.0%). Of the 95 samples collected from patients with diarrhoea, 71.3% were positive, with high rates of bacterial carriage, ranging from 4.2% for Tropheryma whipplei to 45.3% for Entero-pathogenic Escherichia coli. Of the 141 blood samples collected from patients with fever, 31.9% were positive including Plasmodium falciparum (21.3%), Borrelia sp. (5.7%) and dengue virus (5.0%). CONCLUSION: This study provides insight into the aetiology of most common infections at the GMT on which to base therapeutic options.


Asunto(s)
Infecciones del Sistema Respiratorio , Streptococcus pneumoniae , Humanos , Femenino , Adolescente , Masculino , Streptococcus pneumoniae/genética , Bacterias , Moraxella catarrhalis/genética , Reacción en Cadena de la Polimerasa , Atención a la Salud , Infecciones del Sistema Respiratorio/epidemiología , Infecciones del Sistema Respiratorio/microbiología
8.
Clin Infect Dis ; 76(8): 1382-1390, 2023 04 17.
Artículo en Inglés | MEDLINE | ID: mdl-36571112

RESUMEN

BACKGROUND: Louse-borne trench fever caused by Bartonella quintana is a neglected public health concern, known to be transmitted from body louse feces via scratching. No viable B. quintana have ever been isolated from head lice before; therefore, their role as a vector is still poorly understood. METHODS: In Senegal, the implementation of a permanent local surveillance system in a point-of-care laboratory (POC) allows the monitoring of emerging diseases. Here we used culture as well as molecular and genomic approaches to document an outbreak of trench fever associated with head lice in the village of Ndiop. Head lice and blood samples were collected from febrile patients between November 2010 and April 2015. Genomes of 2 isolated strains of B. quintana were sequenced and analyzed. RESULTS: A total of 2289 blood samples were collected in the 2010-2015 period. From 2010-2013, B. quintana DNA was detected by polymerase chain reaction (PCR) in 0.25% (4/1580). In 2014, 228 blood samples were collected, along with 161 head lice from 5 individuals. B. quintana DNA was detected in 4.4% (10/228) of blood samples, and in lice specimens collected from febrile patients (61.7%, 50/81) and non-febrile patients (61.4%, 43/70). Two B. quintana strains were isolated from blood and head lice from 2 different patients. Genomic sequence analysis showed 99.98% overall similarity between both strains. CONCLUSIONS: The presence of live B. quintana in head lice, and the genetic identity of strains from patients' blood and head lice during a localized outbreak in Senegal, supports the evidence of head lice vectorial capacity.


Asunto(s)
Bartonella quintana , Infestaciones por Piojos , Pediculus , Fiebre de las Trincheras , Animales , Humanos , Bartonella quintana/genética , Pediculus/genética , Fiebre de las Trincheras/epidemiología , Senegal/epidemiología , Infestaciones por Piojos/epidemiología , Brotes de Enfermedades , ADN
9.
J Infect Dis ; 226(6): 1075-1083, 2022 09 21.
Artículo en Inglés | MEDLINE | ID: mdl-35776143

RESUMEN

BACKGROUND: Rickettsia felis is emergent in tropical areas. Despite its high morbidity, its natural history has not yet been fully determined. We investigated the role of the common household booklouse, Liposcelis bostrychophila, recently found to harbor R. felis. METHODS: Blood samples from 372 febrile patients from Senegalese villages, as well as nasal and skin samples from 264 asymptomatic individuals, were tested for cat flea-associated and booklice-associated strains of R. felis. Dust samples from beds were collected to isolate booklice and R. felis. Mice were infected with aerosol of R. felis strain from naturally infected booklice. RESULTS: Forty febrile patients (11%) were infected by R. felis, including 26 (7%) by the booklice-associated strain. Nine nasal samples (3.4%) and 28 skin samples (10.6%) contained R. felis, including 7 and 24, respectively, with the booklice-associated strain. The presence of live L. bostrychophila was observed in 32 dust samples (16.8%); R. felis was identified in 62 dust samples (32.5%). Several mice samples were positive for R. felis; interstitial lymphohistiocytic infiltrates were identified in lungs. CONCLUSIONS: Liposcelis bostrychophila may be a reservoir of R. felis. The booklice-associated strain is pathogenic in mammals, causing pneumonia. Human infection may be acquired via inhalation of infected booklice particles.


Asunto(s)
Felis , Neumonía , Rickettsia felis , Animales , Polvo , Humanos , Mamíferos , Ratones
11.
Int J Mol Sci ; 21(21)2020 Oct 29.
Artículo en Inglés | MEDLINE | ID: mdl-33138055

RESUMEN

The symbiotic Wolbachia are the most sophisticated mutualistic bacterium among all insect-associated microbiota. Wolbachia-insect relationship fluctuates from the simple facultative/parasitic to an obligate nutritional-mutualistic association as it was the case of the bedbug-Wolbachia from Cimexlectularius. Understanding this association may help in the control of associated arthropods. Genomic data have proven to be reliable tools in resolving some aspects of these symbiotic associations. Although, Wolbachia appear to be fastidious or uncultivated bacteria which strongly limited their study. Here we proposed Drosophila S2 cell line for the isolation and culture model to study Wolbachia strains. We therefore isolated and characterized a novel Wolbachia strain associated with the bedbug Cimexhemipterus, designated as wChem strain PL13, and proposed Wolbachiamassiliensis sp. nov. strain wChem-PL13 a type strain of this new species from new supergroup T. Phylogenetically, T-supergroup was close to F and S-supergroups from insects and D-supergroup from filarial nematodes. We determined the 1,291,339-bp genome of wChem-PL13, which was the smallest insect-associated Wolbachia genomes. Overall, the wChem genome shared 50% of protein coding genes with the other insect-associated facultative Wolbachia strains. These findings highlight the diversity of Wolbachia genotypes as well as the Wolbachia-host relationship among Cimicinae subfamily. The wChem provides folate and riboflavin vitamins on which the host depends, while the bacteria had a limited translation mechanism suggesting its strong dependence to its hosts. However, the clear-cut distinction between mutualism and parasitism of the wChem in C. hemipterus cannot be yet ruled out.


Asunto(s)
Proteínas Bacterianas/genética , Chinches/microbiología , Genoma Bacteriano , Simbiosis/genética , Wolbachia/clasificación , Animales , Genómica , Filogenia , Wolbachia/genética , Wolbachia/aislamiento & purificación
12.
Parasit Vectors ; 13(1): 500, 2020 Oct 01.
Artículo en Inglés | MEDLINE | ID: mdl-33004069

RESUMEN

BACKGROUND: Species of the Tabanidae are potent vectors of human and animal diseases, but they have not been thoroughly investigated to date. In Senegal (West Africa), little information is available on these dipterans. Our objective in this study was to investigate Senegalese tabanids and their diversity by using molecular and proteomics approaches, as well as their associated pathogens. METHODS: A total of 171 female tabanids were collected, including 143 from Casamance and 28 from Niokolo-Koba. The samples were identified morphologically by PCR sequencing and by MALDI-TOF MS, and PCR analysis was employed for pathogen detection and blood-meal characterization. RESULTS: The morphological identification revealed four species concordantly with the molecular identification: Atylotus fuscipes (79.5%), Tabanus guineensis (16.4%), Chrysops distinctipennis (3.5%) and Tabanus taeniola (0.6%) (not identified by PCR). The molecular investigation of pathogens revealed the presence of Trypanosoma theileri (6.6%), Leishmania donovani (6.6%), Setaria digitata (1.5%), Rickettsia spp. (5.1%) and Anaplasmataceae bacteria (0.7%) in A. fuscipes. Tabanus guineensis was positive for L. donovani (35.7%), S. digitata (3.6%) and Anaplasmataceae (17.8%). Leishmania donovani has been detected in 50% of C. distinctipennis specimens and the only T. taeniola specimen. No Piroplasmida, Mansonella spp. or Coxeilla burnetii DNA was detected. In addition to humans (96.43%), Chlorocebus sabeus, a non-human primate, has been identified as a host of (3.57%) analysed tabanids. MALDI-TOF MS enabled us to correctly identify all tabanid species that had good quality spectra and to create a database for future identification. CONCLUSIONS: Tabanids in Senegal could be vectors of several pathogens threatening animal and public health. To fully characterize these dipterans, it is therefore necessary that researchers in entomology and infectiology employ molecular characterization and mass spectrometric techniques such as MALDI-TOF MS to analyse these dipterans in Senegal and West Africa.


Asunto(s)
Dípteros/microbiología , Dípteros/parasitología , Insectos Vectores/microbiología , Insectos Vectores/parasitología , Anaplasmataceae/clasificación , Anaplasmataceae/genética , Anaplasmataceae/aislamiento & purificación , Animales , Dípteros/clasificación , Dípteros/genética , Femenino , Insectos Vectores/clasificación , Insectos Vectores/genética , Leishmania/clasificación , Leishmania/genética , Leishmania/aislamiento & purificación , Senegal , Setaria (Nematodo)/clasificación , Setaria (Nematodo)/genética , Setaria (Nematodo)/aislamiento & purificación , Trypanosoma/clasificación , Trypanosoma/genética , Trypanosoma/aislamiento & purificación
13.
Insects ; 11(7)2020 Jun 29.
Artículo en Inglés | MEDLINE | ID: mdl-32610661

RESUMEN

Vector-borne deadly pathogens cause more than 700,000 deaths annually. They are transmitted by several vectors, among which the mosquito is the most important. Chemical compounds often have devastating side effects, leading to the abandonment of the majority of them. Biological control has been performed by using formulations of Bacillus sphaericus and Bacillus thuringiensis, but their intensive use has led to the emergence of resistance. Currently, the development of new alternative molecules is urgently needed, in order to use them in mosaics or in rotation with already known insecticides for the control of vectors, especially mosquitoes. Here, we attempted to identify bacterial species with potential anti-mosquito actions. Among bacterial strains isolated from dry sandy soil from Senegal, eleven strains from the Bacillales and Actinomycetales orders were chosen for the entomopathogenic activity experiments. Then, we tested their secondary metabolites, which were obtained from the supernatant fraction, and their cell wall and cytoplasmic compounds, which were found in the pellet fraction, in Aedes albopictus larvae, and compared the larval mortality rate with that obtained by using a commercial product. A total of 4/11 (36.36%) of the isolated species exhibited insecticidal activity. B. nealsonii, which is not a well-known bacterium, had the highest larvicidal effect with 70% of the larval mortality, which is highlighted for the first time. The Streptomyces species we isolated seem to be potential new species, and 3/5 (60%) of them exhibited insecticidal activity. Our study reports provide potential candidates for the identification of active molecules to be developed for strengthening the biological control of infectious diseases agents transmitted by mosquitoes.

14.
Vector Borne Zoonotic Dis ; 20(10): 797-799, 2020 10.
Artículo en Inglés | MEDLINE | ID: mdl-32429789

RESUMEN

Crimean-Congo hemorrhagic fever (CCHF) is a tick-borne disease that can be contracted by direct contact with viremic animals or humans. In West Africa, recurrent CCHF outbreaks have been constantly observed in Mauritania and Senegal. Moreover, acquisition and epidemiology of the infection in humans are correlated with the occurrence and the seroprevalence of the virus in livestock. The main objective of this study is to provide updated information on the local spread of CCHF in animals in the northern region of Senegal. Out of a total of 283 animal sera collected, CCHF-specific antibodies were identified in 92 (32.5%; confidence interval [CI]95% 27.1-38.3) sera by double antigen sandwich enzyme-linked immunosorbent assay (ELISA) test. The prevalence of CCHF virus (CCHFV) infection among horses, cattle, sheep, dogs, donkeys, and goats was 70.3% (45/64), 57.1% (8/14), 22.1% (30/136), 18.2% (2/11), 17.2% (5/29), and 6.9% (2/29), respectively. The antibody titers were found significantly affected by age (p < 0.0001) and gender (p < 0.05). High tick infestation by Rhipicephalus spp. and Hyalomma spp. was recorded on horses. The high seroprevalence to CCHFV among animals in the northern region of Senegal observed in this study indicates the permanent presence of the infection in the northern region of the country suggesting the need to strengthen surveillance plans for CCHF in Senegal.


Asunto(s)
Enfermedades de los Perros/virología , Fiebre Hemorrágica de Crimea/veterinaria , Ganado/virología , Animales , Anticuerpos Antivirales/sangre , Perros , Femenino , Virus de la Fiebre Hemorrágica de Crimea-Congo/aislamiento & purificación , Fiebre Hemorrágica de Crimea/sangre , Fiebre Hemorrágica de Crimea/epidemiología , Masculino , Prevalencia , Senegal , Estudios Seroepidemiológicos , Infestaciones por Garrapatas/veterinaria , Garrapatas
15.
Parasit Vectors ; 12(1): 495, 2019 Oct 22.
Artículo en Inglés | MEDLINE | ID: mdl-31640746

RESUMEN

BACKGROUND: Our study aimed to assess the diversity of the species of Anaplasmataceae in Senegal that infect animals and ticks in three areas: near Keur Momar Sarr (northern region), Dielmo and Diop (Sine Saloum, central region of Senegal), and in Casamance (southern region of Senegal). METHODS: A total of 204 ticks and 433 blood samples were collected from ruminants, horses, donkeys and dogs. Ticks were identified morphologically and by molecular characterization targeting the 12S rRNA gene. Molecular characterization of species of Anaplasmataceae infecting Senegalese ticks and animals was conducted using the 23S rRNA, 16S rRNA, rpoB and groEL genes. RESULTS: Ticks were identified as Rhipicephalus evertsi evertsi (84.3%), Hyalomma rufipes (8.3%), Hyalomma impeltatum (4.9%), R. bursa (1.5%) and R. muhsamae (0.9%). The overall prevalence of Anaplasmataceae infection in ticks was 0.9%, whereas 41.1% of the sampled animals were found infected by one of the species belonging to this family. We identified the pathogen Anaplasma ovis in 55.9% of sheep, A. marginale and A. centrale in 19.4% and 8.1%, respectively, of cattle, as well as a putative new species of Anaplasmataceae. Two Anaplasma species commonly infecting ruminants were identified. Anaplasma cf. platys, closely related to A. platys was identified in 19.8% of sheep, 27.7% of goats and 22.6% of cattle, whereas a putative new species, named here provisionally "Candidatus Anaplasma africae", was identified in 3.7% of sheep, 10.3% of goats and 8.1% of cattle. Ehrlichia canis and Anaplasma platys were identified only from dogs sampled in the Keur Momar Sarr area. Ehrlichia canis was identified in 18.8% of dogs and two R. e. evertsi ticks removed from the same sheep. Anaplasma platys was identified in 15.6% of dogs. Neither of the dogs sampled from Casamance region nor the horses and donkeys sampled from Keur Momar Sarr area were found infected by an Anaplasmataceae species. CONCLUSIONS: This study presents a summary of Anaplasmataceae species that infect animals and ticks in three areas from the northern, central and southern regions of Senegal. To our knowledge, our findings demonstrate for the first time the presence of multiple Anaplasmataceae species that infect ticks and domestic animals in Senegal. We recorded two potentially new species commonly infecting ruminants named here provisionally as Anaplasma cf. platys and "Candidatus Anaplasma africae". However, E. canis was the only species identified and amplified from ticks. None of the other Anaplasmataceae species identified in animals were identified in the tick species collected from animals.


Asunto(s)
Infecciones por Anaplasmataceae/veterinaria , Anaplasmataceae/clasificación , Anaplasmataceae/genética , Animales Domésticos/microbiología , Garrapatas/microbiología , Infecciones por Anaplasmataceae/microbiología , Animales , Animales Domésticos/parasitología , Bovinos , Chaperonina 60/genética , ADN Ribosómico/sangre , ADN Ribosómico/química , ADN Ribosómico/aislamiento & purificación , ARN Polimerasas Dirigidas por ADN/genética , Enfermedades de los Perros/microbiología , Enfermedades de los Perros/parasitología , Perros , Equidae/microbiología , Equidae/parasitología , Femenino , Variación Genética , Cabras , Enfermedades de los Caballos/microbiología , Enfermedades de los Caballos/parasitología , Caballos , Masculino , Filogenia , ARN Ribosómico/genética , ARN Ribosómico 16S/genética , ARN Ribosómico 23S/genética , Rumiantes/microbiología , Rumiantes/parasitología , Senegal , Alineación de Secuencia/veterinaria , Ovinos , Infestaciones por Garrapatas/complicaciones , Infestaciones por Garrapatas/veterinaria
16.
Artículo en Inglés | MEDLINE | ID: mdl-28131381

RESUMEN

In Senegal, domestic ruminants play a vital role in the economy and agriculture and as a food source for people. Bartonellosis in animals is a neglected disease in the tropical regions, and little information is available about the occurrence of this disease in African ruminants. Human bartonellosis due to Bartonella quintana has been previously reported in Senegal. In this study, 199 domestic ruminants, including 104 cattle, 43 sheep, and 52 goats were sampled in villages from the Senegalese regions of Sine Saloum and Casamance. We isolated 29 Bartonella strains, all exclusively from cattle. Molecular and genetic characterization of isolated strains identified 27 strains as Bartonella bovis and two strains as potentially new species. The strains described here represent the first Bartonella strains isolated from domestic ruminants in Senegal and the first putative new Bartonella sp. isolated from cattle in Africa.


Asunto(s)
Infecciones por Bartonella/veterinaria , Bartonella/genética , Bartonella/aislamiento & purificación , Enfermedades de los Bovinos/epidemiología , Enfermedades de los Bovinos/microbiología , Bovinos/microbiología , Enfermedades Desatendidas/veterinaria , Animales , Bartonella/clasificación , Infecciones por Bartonella/sangre , Infecciones por Bartonella/epidemiología , Infecciones por Bartonella/microbiología , ADN Bacteriano/genética , Variación Genética , Cabras/microbiología , Humanos , Enfermedades Desatendidas/epidemiología , Enfermedades Desatendidas/microbiología , Filogenia , Prevalencia , Senegal/epidemiología , Análisis de Secuencia de ADN , Ovinos/microbiología
17.
Vector Borne Zoonotic Dis ; 16(5): 359-61, 2016 05.
Artículo en Inglés | MEDLINE | ID: mdl-27002305

RESUMEN

In Africa, infection with West Nile virus (WNV) is frequent but almost always asymptomatic in humans and equids. The aim of this study was to identify whether any other domestic animal living in the same enzootic locality may be the sentinel of WNV circulation. In northwest Senegal, blood samples were collected from 283 adult domestic animals (136 sheep, 64 horses, 29 donkeys, 29 goats, 14 cattle, and 11 dogs), in three localities near Keur Momar Sarr. Each serum was tested for WNV immunoglobulin G using enzyme-linked immunosorbent assay. The prevalence among donkeys, horses, dogs, goats, cattle, and sheep was 86.2%, 68.7%, 27.3%, 6.9%, 0%, and 0%, respectively. This survey confirms that equids and dogs could be the best sentinel animals for surveillance of WNV. The ruminants do not play a role in WNV epidemiology.


Asunto(s)
Animales Domésticos , Fiebre del Nilo Occidental/veterinaria , Virus del Nilo Occidental/aislamiento & purificación , Animales , Senegal/epidemiología , Fiebre del Nilo Occidental/epidemiología , Fiebre del Nilo Occidental/virología
18.
Viruses ; 8(3): 77, 2016 Mar 11.
Artículo en Inglés | MEDLINE | ID: mdl-26978389

RESUMEN

More than two thirds of emerging viruses are of zoonotic origin, and among them RNA viruses represent the majority. Ceratopogonidae (genus Culicoides) are well-known vectors of several viruses responsible for epizooties (bluetongue, epizootic haemorrhagic disease, etc.). They are also vectors of the only known virus infecting humans: the Oropouche virus. Female midges usually feed on a variety of hosts, leading to possible transmission of emerging viruses from animals to humans. In this context, we report here the analysis of RNA viral communities of Senegalese biting midges using next-generation sequencing techniques as a preliminary step toward the identification of potential viral biohazards. Sequencing of the RNA virome of three pools of Culicoides revealed the presence of a significant diversity of viruses infecting plants, insects and mammals. Several novel viruses were detected, including a novel Thogotovirus species, related but genetically distant from previously described tick-borne thogotoviruses. Novel rhabdoviruses were also detected, possibly constituting a novel Rhabdoviridae genus, and putatively restricted to insects. Sequences related to the major viruses transmitted by Culicoides, i.e., African horse sickness, bluetongue and epizootic haemorrhagic disease viruses were also detected. This study highlights the interest in monitoring the emergence and circulation of zoonoses and epizooties using their arthropod vectors.


Asunto(s)
Biota , Ceratopogonidae/virología , Vectores de Enfermedades , Virus ARN/clasificación , Virus ARN/aislamiento & purificación , Animales , Secuenciación de Nucleótidos de Alto Rendimiento , Senegal
19.
Am J Trop Med Hyg ; 93(3): 601-6, 2015 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-26078318

RESUMEN

Large parts of African and American countries are colonized by Mansonella, a very common but poorly described filarial nematode. Bloodsucking flies of the genus Culicoides are suspected to be the vector of Mansonella perstans, but no study in Senegal has confirmed that Culicoides can transmit the parasite. Designed specific real-time quantitative polymerase chain reaction (qPCR) can be used to identify microfilaria in stained blood smears. This study was performed in July and December 2010 in the southeastern Senegal, which is known to be endemic for M. perstans. We analyzed 297 blood smears from febrile and afebrile resident people by qPCR. The global prevalence of M. perstans was approximately 14.5% in both febrile and afebrile individuals. The age group of > 30 years had the highest prevalence (22.0%). No Culicoides among 1,159 studied specimens was positive for M. perstans and its vector in Senegal still requires identification.


Asunto(s)
Mansonella , Mansoneliasis/epidemiología , Adolescente , Adulto , Factores de Edad , Animales , Ceratopogonidae/parasitología , Niño , Preescolar , Femenino , Humanos , Lactante , Insectos Vectores/parasitología , Masculino , Mansoneliasis/transmisión , Persona de Mediana Edad , Prevalencia , Reacción en Cadena en Tiempo Real de la Polimerasa , Población Rural/estadística & datos numéricos , Senegal/epidemiología , Adulto Joven
20.
J Clin Microbiol ; 53(2): 410-8, 2015 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-25411169

RESUMEN

Biting midges of the genus Culicoides are implicated as vectors for a wide variety of pathogens. The morphological identification of these arthropods may be difficult because of a lack of detailed investigation of taxonomy for this species in Africa. However, matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) profiling is efficient for arthropod identification at the species level. This study established a spectrum database of Culicoides spp. from Senegal using MALDI-TOF. Identification of Culicoides insects to the species level before mass spectrometry was performed on the basis of morphological characters. MALDI-TOF MS reference spectra were determined for 437 field-caught Culicoides of 10 species. The protein profiles of all tested Culicoides revealed several peaks with mass ranges of 2 to 20 kDa. In a validation study, 72 Culicoides specimens in the target species were correctly identified at the species level with a similarity of 95 to 99.9%. Four Culicoides protein profiles were misidentified. Nevertheless, six SuperSpectra (C. imicola, C. enderleini, C. oxystoma, C. kingi, C. magnus, and C. fulvithorax) were created. Abdomens of midges were used to amplify and sequence a portion of the mitochondrial cytochrome oxidase I gene (COI). The results obtained using the MALDI-TOF MS method were consistent with the morphological identification and similar to the genetic identification. Protein profiling using MALDI-TOF is an efficient approach for the identification of Culicoides spp., and it is economically advantageous for approaches that require detailed and quantitative information of vector species that are collected in field. The database of African Culicoides MS spectra created is the first database in Africa. The COI sequences of five Culicoides species that were previously noncharacterized using molecular methods were deposited in GenBank.


Asunto(s)
Ceratopogonidae/clasificación , Entomología/métodos , Técnicas de Diagnóstico Molecular/métodos , Espectrometría de Masa por Láser de Matriz Asistida de Ionización Desorción/métodos , Animales , Ceratopogonidae/química , Ceratopogonidae/genética , Complejo IV de Transporte de Electrones/genética , Femenino , Masculino , Mitocondrias/enzimología , Senegal
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