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1.
Nature ; 590(7846): 468-472, 2021 02.
Artigo em Inglês | MEDLINE | ID: mdl-33505020

RESUMO

Neutralizing antibody function provides a foundation for the efficacy of vaccines and therapies1-3. Here, using a robust in vitro Ebola virus (EBOV) pseudo-particle infection assay and a well-defined set of solid-phase assays, we describe a wide spectrum of antibody responses in a cohort of healthy survivors of the Sierra Leone EBOV outbreak of 2013-2016. Pseudo-particle virus-neutralizing antibodies correlated with total anti-EBOV reactivity and neutralizing antibodies against live EBOV. Variant EBOV glycoproteins (1995 and 2014 strains) were similarly neutralized. During longitudinal follow-up, antibody responses fluctuated in a 'decay-stimulation-decay' pattern that suggests de novo restimulation by EBOV antigens after recovery. A pharmacodynamic model of antibody reactivity identified a decay half-life of 77-100 days and a doubling time of 46-86 days in a high proportion of survivors. The highest antibody reactivity was observed around 200 days after an individual had recovered. The model suggests that EBOV antibody reactivity declines over 0.5-2 years after recovery. In a high proportion of healthy survivors, antibody responses undergo rapid restimulation. Vigilant follow-up of survivors and possible elective de novo antigenic stimulation by vaccine immunization should be considered in order to prevent EBOV viral recrudescence in recovering individuals and thereby to mitigate the potential risk of reseeding an outbreak.


Assuntos
Anticorpos Antivirais/sangue , Anticorpos Antivirais/imunologia , Convalescença , Ebolavirus/imunologia , Doença pelo Vírus Ebola/imunologia , Sobreviventes , Adolescente , Adulto , África Ocidental/epidemiologia , Anticorpos Neutralizantes/sangue , Anticorpos Neutralizantes/imunologia , Estudos de Coortes , Feminino , Meia-Vida , Doença pelo Vírus Ebola/sangue , Doença pelo Vírus Ebola/epidemiologia , Doença pelo Vírus Ebola/prevenção & controle , Humanos , Masculino , Pessoa de Meia-Idade , Testes de Neutralização , Fatores de Tempo , Viremia/sangue , Viremia/imunologia , Adulto Jovem
2.
J Infect Dis ; 230(1): 183-187, 2024 Jul 25.
Artigo em Inglês | MEDLINE | ID: mdl-39052713

RESUMO

Accurate detection of viable Leishmania parasites is critical for evaluating visceral leishmaniasis (VL) treatment response at an early timepoint. We compared the decay of kinetoplast DNA (kDNA) and spliced-leader RNA (SL-RNA) in vitro, in vivo, and in a VL patient cohort. An optimized combination of blood preservation and nucleic acid extraction improved efficiency for both targets. SL-RNA degraded more rapidly during treatment than kDNA, and correlated better with microscopic examination. SL-RNA quantitative polymerase chain reaction emerges as a superior method for dynamic monitoring of viable Leishmania parasites. It enables individualized treatment monitoring for improved prognoses and has potential as an early surrogate endpoint in clinical trials.


Assuntos
DNA de Cinetoplasto , Leishmaniose Visceral , RNA Líder para Processamento , Humanos , Leishmaniose Visceral/diagnóstico , Leishmaniose Visceral/tratamento farmacológico , Leishmaniose Visceral/parasitologia , DNA de Cinetoplasto/genética , RNA Líder para Processamento/genética , RNA Líder para Processamento/metabolismo , RNA de Protozoário/genética , RNA de Protozoário/análise , Animais , Leishmania/genética , Antiprotozoários/uso terapêutico , Biomarcadores
3.
Clin Infect Dis ; 78(3): 554-561, 2024 03 20.
Artigo em Inglês | MEDLINE | ID: mdl-37976173

RESUMO

BACKGROUND: Bartonella quintana is a louse-borne bacterium that remains a neglected cause of endocarditis in low-resource settings. Our understanding of risk factors, clinical manifestations, and treatment of B. quintana endocarditis are biased by older studies from high-income countries. METHODS: We searched Pubmed Central, Medline, Scopus, Embase, EBSCO (CABI) Global Health, Web of Science and international trial registers for articles published before March 2023 with terms related to Bartonella quintana endocarditis. We included articles containing case-level information on B. quintana endocarditis and extracted data related to patient demographics, clinical features, diagnostic testing, treatment, and outcome. RESULTS: A total of 975 records were identified, of which 569 duplicates were removed prior to screening. In total, 84 articles were eligible for inclusion, describing a total of 167 cases. Infections were acquired in 40 different countries; 62 cases (37.1%) were acquired in low- and middle-income countries (LMICs). Disproportionately more female and pediatric patients were from LMICs. More patients presented with heart failure (n = 70/167 [41.9%]) than fever (n = 65/167 [38.9%]). Mean time from symptom onset to presentation was 5.1 months. Also, 25.7% of cases (n = 43/167) were associated with embolization, most commonly to the spleen and brain; 65.5% of antimicrobial regimens included doxycycline. The vast majority of cases underwent valve replacement surgery (n = 154/167, [98.0%]). Overall case fatality rate was 9.6% (n = 16/167). CONCLUSIONS: B. quintana endocarditis has a global distribution, and long delays between symptom onset and presentation frequently occur. Improved clinician education and diagnostic capacity are needed to screen at-risk populations and identify infection before endocarditis develops.


Assuntos
Bartonella quintana , Endocardite Bacteriana , Endocardite , Febre das Trincheiras , Humanos , Feminino , Criança , Febre das Trincheiras/diagnóstico , Febre das Trincheiras/epidemiologia , Febre das Trincheiras/tratamento farmacológico , Endocardite/diagnóstico , Endocardite/epidemiologia , Endocardite/terapia , Doxiciclina/uso terapêutico , Endocardite Bacteriana/diagnóstico , Endocardite Bacteriana/tratamento farmacológico , Endocardite Bacteriana/epidemiologia
4.
Clin Infect Dis ; 79(1): 240-246, 2024 Jul 19.
Artigo em Inglês | MEDLINE | ID: mdl-38193647

RESUMO

BACKGROUND: People with human immunodeficiency virus (PWH) with recurrent visceral leishmaniasis (VL) could potentially drive Leishmania transmission in areas with anthroponotic transmission such as East Africa, but studies are lacking. Leishmania parasitemia has been used as proxy for infectiousness. METHODS: This study is nested within the Predicting Visceral Leishmaniasis in HIV-InfectedPatients (PreLeisH) prospective cohort study, following 490 PWH free of VL at enrollment for up to 24-37 months in northwest Ethiopia. Blood Leishmania polymerase chain reaction (PCR) was done systematically. This case series reports on 10 PWH with chronic VL (≥3 VL episodes during follow-up) for up to 37 months, and 3 individuals with asymptomatic Leishmania infection for up to 24 months. RESULTS: All 10 chronic VL cases were male, on antiretroviral treatment, with 0-11 relapses before enrollment. Median baseline CD4 count was 82 cells/µL. They displayed 3-6 VL treatment episodes over a period up to 37 months. Leishmania blood PCR levels were strongly positive for almost the entire follow-up (median cycle threshold value, 26 [interquartile range, 23-30]), including during periods between VL treatment. Additionally, we describe 3 PWH with asymptomatic Leishmania infection and without VL history, with equally strong Leishmania parasitemia over a period of up to 24 months without developing VL. All were on antiretroviral treatment at enrollment, with baseline CD4 counts ranging from 78 to 350 cells/µL. CONCLUSIONS: These are the first data on chronic parasitemia in PWH from Leishmania donovani-endemic areas. PWH with asymptomatic and symptomatic Leishmania infection could potentially be highly infectious and constitute Leishmania superspreaders. Xenodiagnosis studies are required to confirm infectiousness.


Assuntos
Infecções por HIV , Leishmaniose Visceral , Parasitemia , Humanos , Leishmaniose Visceral/epidemiologia , Leishmaniose Visceral/transmissão , Etiópia/epidemiologia , Masculino , Infecções por HIV/complicações , Infecções por HIV/epidemiologia , Adulto , Parasitemia/epidemiologia , Parasitemia/parasitologia , Estudos Prospectivos , Pessoa de Meia-Idade , Doenças Endêmicas , Contagem de Linfócito CD4 , Reação em Cadeia da Polimerase
5.
Emerg Infect Dis ; 30(1): 125-128, 2024 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-37967521

RESUMO

We report 4 cases of human African trypanosomiasis that occurred in Ethiopia in 2022, thirty years after the last previously reported case in the country. Two of 4 patients died before medicine became available. We identified the infecting parasite as Trypanosoma brucei rhodesiense. Those cases imply human African trypanosomiasis has reemerged.


Assuntos
Tripanossomíase Africana , Animais , Humanos , Tripanossomíase Africana/diagnóstico , Tripanossomíase Africana/epidemiologia , Tripanossomíase Africana/parasitologia , Trypanosoma brucei rhodesiense , Etiópia/epidemiologia
6.
Emerg Infect Dis ; 29(1): 1-9, 2023 01.
Artigo em Inglês | MEDLINE | ID: mdl-36573642

RESUMO

During the 10th outbreak of Ebola virus disease in the Democratic Republic of the Congo, the Institut National de Recherche Biomédicale strategically positioned 13 decentralized field laboratories with dedicated equipment to quickly detect cases as the outbreak evolved. The laboratories were operated by national staff, who quickly handed over competencies and skills to local persons to successfully manage future outbreaks. Laboratories analyzed ≈230,000 Ebola diagnostic samples under stringent biosafety measures, documentation, and database management. Field laboratories diversified their activities (diagnosis, chemistry and hematology, survivor follow-up, and genomic sequencing) and shipped 127,993 samples from the field to a biorepository in Kinshasa under good conditions. Deploying decentralized and well-equipped laboratories run by local personnel in at-risk countries for Ebola virus disease outbreaks is an efficient response; all activities are quickly conducted in the field.


Assuntos
Ebolavirus , Doença pelo Vírus Ebola , Humanos , Doença pelo Vírus Ebola/diagnóstico , Doença pelo Vírus Ebola/epidemiologia , Doença pelo Vírus Ebola/prevenção & controle , Ebolavirus/genética , Laboratórios , República Democrática do Congo/epidemiologia , Surtos de Doenças
7.
J Med Virol ; 95(5): e28769, 2023 05.
Artigo em Inglês | MEDLINE | ID: mdl-37212312

RESUMO

The risk of infection after exposure to clade IIb mpox virus (MPXV) is unknown, and potential presymptomatic shedding of MPXV remains to be demonstrated. High-risk contacts of mpox patients were followed-up in a prospective longitudinal cohort study. Individuals reporting sexual contact, >15 min skin-to-skin contact, or living in the same household with an mpox patient were recruited in a sexual health clinic in Antwerp, Belgium. Participants kept a symptom diary, performed daily self-sampling (anorectal, genital, and saliva), and presented for weekly clinic visits for physical examination and sampling (blood and oropharyngeal). Samples were tested for MPXV by PCR. Between June 24 and July 31, 2022, 25 contacts were included, of which 12/18 (66.0%) sexual and 1/7 (14.0%) nonsexual contacts showed evidence of infection by MPXV-PCR. Six cases had typical mpox symptoms. Viral DNA was detected as early as 4 days before symptom onset in 5 of them. In 3 of these cases, replication-competent virus was demonstrated in the presymptomatic phase. These findings confirm the existence of presymptomatic shedding of replication-competent MPXV and emphasize the high risk of transmission during sexual contact. Sexual contacts of mpox cases should abstain from sex during the incubation period, irrespective of symptoms.


Assuntos
Mpox , Humanos , Estudos Longitudinais , Estudos Prospectivos , Eliminação de Partículas Virais , Instituições de Assistência Ambulatorial
8.
Euro Surveill ; 28(7)2023 02.
Artigo em Inglês | MEDLINE | ID: mdl-36795501

RESUMO

While mpox was well characterised during the 2022 global Clade IIb outbreak, little is known about persistent morbidity. We present interim results of a prospective cohort study of 95 mpox patients assessed 3-20 weeks post-symptom onset. Two-thirds of participants had residual morbidity, including 25 with persistent anorectal and 18 with genital symptoms. Loss of physical fitness, new-onset/worsened fatigue and mental health problems were reported in 36, 19 and 11 patients, respectively. These findings require attention by healthcare providers.


Assuntos
Surtos de Doenças , Mpox , Humanos , Bélgica/epidemiologia , Seguimentos , Morbidade , Estudos Prospectivos , Mpox/epidemiologia , Mpox/patologia
9.
Clin Infect Dis ; 74(11): 1972-1978, 2022 06 10.
Artigo em Inglês | MEDLINE | ID: mdl-34463732

RESUMO

BACKGROUND: Information on human filariasis in international travelers is scarce. We describe the epidemiology, clinical presentation, and outcome of these infections in a reference travel clinic over the past decades. METHODS: We reviewed all cases of filariasis diagnosed at the Institute of Tropical Medicine, Antwerp, Belgium, from 1994 to 2018. Diagnosis was obtained by either parasitological methods (confirmed) or strict clinical case definitions (probable). We assessed the characteristics of cases at diagnosis and response to therapy within 3-12 months. RESULTS: A total of 320 patients (median age: 41 years; 71% males) were diagnosed with 327 filarial infections (Wuchereria bancrofti = 6, Onchocerca volvulus = 33, Loa loa = 150, Mansonella perstans = 130, unspecified species = 8). Diagnosis was confirmed in 213/320 (67%) patients. European long-term travelers accounted for 166 patients (52%) and visitors/migrants from tropical countries for another 110 (34%). Central Africa was the likely region of acquisition for 294 (92%) patients. The number of filariasis cases decreased from 21.5/year on average in the 1990s to 6.3/year in the past decade, when loiasis became predominant. Cases reported symptoms in >80% of all filarial infections but mansonellosis (45/123 single infections; 37%). Lymphatic filariasis and onchocerciasis cases responded well to conventional therapy. However, 30% of patients with loiasis and mansonellosis experienced treatment failure (with diethylcarbamazine and levamisole-mebendazole, respectively). CONCLUSIONS: The burden and species distribution of filariasis in travelers evolved in the past decades. Most presentations were symptomatic. Case management would benefit from more effective therapies for loiasis and mansonellosis.


Assuntos
Filariose Linfática , Loíase , Mansonelose , Migrantes , Medicina Tropical , Adulto , Animais , Bélgica/epidemiologia , Filariose Linfática/epidemiologia , Feminino , Humanos , Loíase/diagnóstico , Loíase/tratamento farmacológico , Loíase/epidemiologia , Masculino , Mansonelose/diagnóstico , Mansonelose/tratamento farmacológico , Mansonelose/epidemiologia , Estudos Retrospectivos
10.
Trop Med Int Health ; 27(4): 418-425, 2022 04.
Artigo em Inglês | MEDLINE | ID: mdl-35229414

RESUMO

OBJECTIVE: We assessed healthcare workers (HCWs) COVID-19 vaccine acceptability in Ethiopia. METHODS: We carried out a cross-sectional survey from February to April 2021 in HCWs from five teaching hospitals. HCWs were selected using convenient sampling, and data were collected through a survey link. Descriptive analysis and mixed-effect logistic regression were performed. A total of 1,314 HCWs participated in the study. RESULTS: We found that 25.5% (n = 332) of the HCWs would not accept a COVID-19 vaccine and 20.2% (n = 264) were not willing to recommend COVID-19 vaccination to others. Factors associated with vaccine non-acceptance were female sex (AOR = 1.8; 95% CI: 1.3-2.5), the perception that vaccines are unsafe (AOR = 15.0; 95% CI: 8.7-25.9), not considering COVID-19 as health risk (AOR = 4.4; 95% CI: 2.0-9.5) and being unconcerned about contracting COVID-19 at work (AOR = 3.5; 95% CI: 1.5-8.4). Physicians were more willing to accept vaccination than other HCWs. Higher vaccine acceptability was also noted with increasing age. Participants most often indicated safety concerns as the determining factor on their decision to get vaccinated or not. CONCLUSION: Overall, a quarter of HCWs would not accept a COVID-19 vaccine. Communications and training should address vaccine safety concerns. Additionally, emphasis should be given to showing current and future impact of COVID-19 on the personal, public and country level unless control efforts are improved. Interventions aimed to increase vaccine uptake should focus their efforts on younger and non-physician HCWs.


Assuntos
Vacinas contra COVID-19 , COVID-19 , COVID-19/prevenção & controle , Estudos Transversais , Etiópia , Feminino , Pessoal de Saúde , Humanos , SARS-CoV-2 , Vacinação
11.
Trop Med Int Health ; 27(3): 271-279, 2022 03.
Artigo em Inglês | MEDLINE | ID: mdl-35029010

RESUMO

OBJECTIVE: Causes of acute febrile illness (AFI) often remain undetermined in developing countries, due to overlap of symptoms and limited available diagnostics. We aimed to assess the aetiology of AFI in adults in a referral hospital in northwest Ethiopia. METHODS: While all participants were tested for malaria by rapid diagnostic test (RDT), microscopy was only done on physician's request. Dengue virus (DENV) infections were detected using an RDT and ELISAs and dengue, yellow fever and chikungunya cases were identified by PCR. Bacterial aetiologies were investigated using blood culture and PCR. RESULTS: The aetiology of acute infection was identified for 20.5% of 200 patients enrolled. Eleven percent tested positive for Plasmodium, while microscopy was only requested for half of the identified malaria cases. For 4.0% of the Plasmodium-infected patients, an acute or past DENV (co-)infection was detected. We found 7.5% acute and 13.0% past DENV - all serotype 3 - infections. Bacterial infections were observed in 4.5% of the patients. CONCLUSION: Malaria is still a considerable aetiology of AFI and dengue is underrecognised. There are areas where both diseases occur concomitantly, and the DENV-3 serotype presumably spreads from Sudan to northern Ethiopia. As only 20.5% of the aetiologies were identified, a broader testing platform is required.


Assuntos
Coinfecção , Dengue , Malária , Plasmodium , Adulto , Dengue/complicações , Dengue/diagnóstico , Dengue/epidemiologia , Serviço Hospitalar de Emergência , Etiópia/epidemiologia , Febre/diagnóstico , Febre/etiologia , Hospitais , Humanos , Malária/complicações , Malária/diagnóstico , Malária/epidemiologia
12.
Euro Surveill ; 27(48)2022 12.
Artigo em Inglês | MEDLINE | ID: mdl-36695462

RESUMO

Vaccination is important in containing the 2022 mpox (formerly monkeypox) epidemic. We describe five Belgian patients with localised severe symptoms of proctitis and penile oedema, occurring between 4 and 35 days after post-exposure preventive vaccination or after one- or two-dose off-label pre-exposure preventive vaccination with MVA-BN vaccine. Genome sequencing did not reveal evidence for immune escape variants. Healthcare workers and those at risk should be aware of possible infections occurring shortly after vaccination and the need for other preventive measures.


Assuntos
Mpox , Vacina Antivariólica , Humanos , Bélgica/epidemiologia , Mpox/prevenção & controle , Vacina Antivariólica/efeitos adversos , Vacinação/efeitos adversos
13.
Lancet ; 393(10174): 936-948, 2019 03 02.
Artigo em Inglês | MEDLINE | ID: mdl-30777297

RESUMO

Ebolaviruses are pathogenic agents associated with a severe, potentially fatal, systemic disease in man and great apes. Four species of ebolaviruses have been identified in west or equatorial Africa. Once the more virulent forms enter the human population, transmission occurs primarily through contact with infected body fluids and can result in major epidemics in under-resourced settings. These viruses cause a disease characterised by systemic viral replication, immune suppression, abnormal inflammatory responses, major fluid and electrolyte losses, and high mortality. Despite recent progress on vaccines, and with no licensed prophylaxis or treatment available, case management is essentially supportive with management of severe multiple organ failure resulting from immune-mediated cell damage. The 2013-16 outbreak was classified by WHO as a Public Health Emergency of International Concern, which drew attention to the challenges of diseases caused by infections with ebolaviruses and questioned scientific, clinical, and societal preparation to handle future epidemics.


Assuntos
Surtos de Doenças/prevenção & controle , Ebolavirus , Doença pelo Vírus Ebola , África Ocidental/epidemiologia , Animais , Surtos de Doenças/estatística & dados numéricos , Progressão da Doença , Vacinas contra Ebola/imunologia , Ebolavirus/classificação , Ebolavirus/imunologia , Doença pelo Vírus Ebola/sangue , Doença pelo Vírus Ebola/mortalidade , Doença pelo Vírus Ebola/terapia , Doença pelo Vírus Ebola/transmissão , Humanos , Cooperação Internacional
14.
BMC Infect Dis ; 20(1): 209, 2020 Mar 12.
Artigo em Inglês | MEDLINE | ID: mdl-32164581

RESUMO

BACKGROUND: Hepatitis C virus (HCV) infection is a major global health problem. WHO guidelines recommend screening all people living with HIV for hepatitis C. Considering the limited resources for health in low and middle income countries, targeted HCV screening is potentially a more feasible screening strategy for many HIV cohorts. Hence there is an interest in developing clinician-friendly tools for selecting subgroups of HIV patients for whom HCV testing should be prioritized. Several statistical methods have been developed to predict a binary outcome. Multiple studies have compared the performance of different predictive models, but results were inconsistent. METHODS: A cross-sectional HCV diagnostic study was conducted in the HIV cohort of Sihanouk Hospital Center of Hope in Phnom Penh, Cambodia. We compared the performance of logistic regression, Spiegelhalter-Knill-Jones and CART to predict Hepatitis C co-infection in this cohort. We estimated the number of HCV co-infections that would be missed. To correct for over-optimism, the leave-one-out bootstrap estimator was used for estimating this quantity. RESULTS: Logistic regression misses the fewest HCV co-infections (8%), but would still refer 98% of HIV patients for HCV testing. Spiegelhalter-Knill-Jones (SKJ) and CART respectively miss 12% and 29% of HCV co-infections but would only refer about 30% for HCV testing. CONCLUSIONS: In our dataset, logistic regression has the highest log-likelihood and smallest proportions of HCV co-infections missed but Spiegelhalter-Knill-Jones has the highest area under the ROC curve. The likelihood ratios estimated by Spiegelhalter-Knill-Jones might be easier to interpret for clinicians than odds ratios estimated by logistic regression or the decision tree from CART. CART is the most flexible method, and no model has to be specified regarding presence of interactions and form of the relationship between outcome and predictor variables.


Assuntos
Infecções por HIV/virologia , Hepatite C/diagnóstico , Adulto , Camboja , Estudos de Coortes , Coinfecção/virologia , Estudos Transversais , Feminino , Infecções por HIV/complicações , Hepatite C/complicações , Hepatite C/virologia , Humanos , Modelos Logísticos , Masculino , Pessoa de Meia-Idade , Modelos Teóricos , Razão de Chances , Curva ROC
16.
Curr Ther Res Clin Exp ; 92: 100583, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32382359

RESUMO

BACKGROUND: Human visceral leishmaniasis (VL) is a life-threatening protozoan disease caused by parasites belonging to the Leishmania donovani complex. Ethiopia has the highest VL-HIV co-infection rate in the world, with several of these patients presenting with repeated episodes of VL disease (ie, relapse). However, we lack data on how HIV patients with multiple VL relapse present clinically, and whether they continue to respond to currently available medicines. METHODS: The medical records of VL-HIV co-infected patients with multiple VL relapses at the Leishmaniasis Treatment and Research Center in Gondar, Ethiopia, between June 2012 and June 2016 were retrieved. Variables on their clinical and laboratory profiles were collected. Descriptive analysis was done to show the characteristics of the VL episodes. RESULT: A total of 48 VL episodes in 12 patients were identified, the median number of episodes per patient was 5 (interquartile range, 4-8 episodes). The median time to relapse was 5 months (interquartile range, 3-5.5 months). Splenomegaly was present in 47 of the episodes (98%), fever or other accompanying symptoms were present in only 66% (32 out of 48). The median tissue parasite grade at VL diagnosis was 6+ (interquartile range, 5+- 6+). All patients were on antiretroviral therapy. The median duration of treatment per episode was 2 months (interquartile range, 2-2 months). All patients achieved parasitological cure at discharge at each episode. CONCLUSIONS: Multiple recurrences of VL diseases were observed in HIV co-infected patients. With recurrent episodes, splenomegaly was found to be the main manifestation, whereas fever was less common. These patients came with recurrence of diseases in <6 months and required prolonged treatment to achieve cure.Further research on prediction, prevention, and better management options for recurrent VL is needed. ORCID ID: https://orcid.org/0000-0002-1410-0454. (Curr Ther Res Clin Exp. 2020; 81:XXX-XXX).

17.
N Engl J Med ; 374(1): 33-42, 2016 Jan 07.
Artigo em Inglês | MEDLINE | ID: mdl-26735992

RESUMO

BACKGROUND: In the wake of the recent outbreak of Ebola virus disease (EVD) in several African countries, the World Health Organization prioritized the evaluation of treatment with convalescent plasma derived from patients who have recovered from the disease. We evaluated the safety and efficacy of convalescent plasma for the treatment of EVD in Guinea. METHODS: In this nonrandomized, comparative study, 99 patients of various ages (including pregnant women) with confirmed EVD received two consecutive transfusions of 200 to 250 ml of ABO-compatible convalescent plasma, with each unit of plasma obtained from a separate convalescent donor. The transfusions were initiated on the day of diagnosis or up to 2 days later. The level of neutralizing antibodies against Ebola virus in the plasma was unknown at the time of administration. The control group was 418 patients who had been treated at the same center during the previous 5 months. The primary outcome was the risk of death during the period from 3 to 16 days after diagnosis with adjustments for age and the baseline cycle-threshold value on polymerase-chain-reaction assay; patients who had died before day 3 were excluded. The clinically important difference was defined as an absolute reduction in mortality of 20 percentage points in the convalescent-plasma group as compared with the control group. RESULTS: A total of 84 patients who were treated with plasma were included in the primary analysis. At baseline, the convalescent-plasma group had slightly higher cycle-threshold values and a shorter duration of symptoms than did the control group, along with a higher frequency of eye redness and difficulty in swallowing. From day 3 to day 16 after diagnosis, the risk of death was 31% in the convalescent-plasma group and 38% in the control group (risk difference, -7 percentage points; 95% confidence interval [CI], -18 to 4). The difference was reduced after adjustment for age and cycle-threshold value (adjusted risk difference, -3 percentage points; 95% CI, -13 to 8). No serious adverse reactions associated with the use of convalescent plasma were observed. CONCLUSIONS: The transfusion of up to 500 ml of convalescent plasma with unknown levels of neutralizing antibodies in 84 patients with confirmed EVD was not associated with a significant improvement in survival. (Funded by the European Union's Horizon 2020 Research and Innovation Program and others; ClinicalTrials.gov number, NCT02342171.).


Assuntos
Transfusão de Componentes Sanguíneos , Doença pelo Vírus Ebola/terapia , Plasma , Adolescente , Adulto , Anticorpos Neutralizantes/sangue , Transfusão de Componentes Sanguíneos/efeitos adversos , Criança , Pré-Escolar , Convalescença , Ebolavirus/imunologia , Feminino , Guiné , Doença pelo Vírus Ebola/mortalidade , Humanos , Lactente , Masculino , Pessoa de Meia-Idade , Razão de Chances , Plasma/imunologia , Gravidez , Adulto Jovem
18.
Transfusion ; 58(5): 1289-1298, 2018 05.
Artigo em Inglês | MEDLINE | ID: mdl-29572862

RESUMO

BACKGROUND: Passive therapy with convalescent plasma provides an early opportunity to intervene in Ebola virus disease (EVD). Methods for field screening and selection of potential donors and quantifying plasma antibody are needed. STUDY DESIGN AND METHODS: Recombinant Ebola virus glycoprotein (EBOV GP) was formatted into immunoglobulin G-capture, competitive, and double-antigen bridging enzyme immunoassays (EIAs). EVD survivors in Freetown, Sierra Leone, were recruited as potential plasma donors and assessed locally using sera alone and/or paired sera and oral fluids (ORFs). Uninfected controls comprised unexposed Gambians and communities in Western Area, Sierra Leone. Antibody neutralization in selected sera was measured retrospectively in a pseudotype virus assay. RESULTS: A total of 115 potential donors were considered for enrollment: 110 plasma samples were concordantly reactive in the three EIAs; three were concordantly unreactive and two were reactive in two of three EIAs (98.2% agreement; 95% confidence interval [CI], 93.9%-99.8%). In 88 donors with paired ORF and plasma, G-capture EIA reactivity correlated well in the two analytes (R2 = 0.795). Plasma and ORF from 44 Gambians were unreactive. ORF samples from 338 of 339 unexposed Western Area community controls were unreactive (specificity, 99.7%; 95% CI, 98.4%-99.7%); ORF samples from 113 of 116 Kerry Town EVD survivors were reactive (sensitivity, 97.4%; 95% CI, 92.5%-99.5%). Strong reactivity in G-capture and/or competitive EIAs identified donors with high plasma EBOV GP antibody levels in the double-antigen bridging assay, correlating with high levels of neutralizing antibody. CONCLUSIONS: In-field testing can qualify convalescent donors for providing high-titer antibody.


Assuntos
Anticorpos Neutralizantes/sangue , Doadores de Sangue , Ebolavirus/imunologia , Doença pelo Vírus Ebola/imunologia , Convalescença , Doença pelo Vírus Ebola/diagnóstico , Doença pelo Vírus Ebola/terapia , Doença pelo Vírus Ebola/transmissão , Humanos , Estudos Retrospectivos , Sensibilidade e Especificidade , Serra Leoa
19.
Clin Infect Dis ; 65(10): 1703-1710, 2017 Oct 30.
Artigo em Inglês | MEDLINE | ID: mdl-29020196

RESUMO

BACKGROUND: East Africa, where Leishmania donovani is prevalent, faces the highest burden world-wide of visceral leishmaniasis (VL) and human immunodeficiency virus (HIV) coinfection. However, data on the risk and predictors of VL relapse are scarce. Such information is vital to target medical follow-up and interventions to those at highest risk. METHODS: We conducted a retrospective cohort study at a Médecins Sans Frontières-supported health center in northwest Ethiopia. We included adult VL-HIV coinfected patients treated for VL and discharged cured between February 2008 and February 2013. The risk of relapse was calculated using Kaplan-Meier methods, and predictors were determined using Cox regression models. RESULTS: Of the 146 patients included, 140 (96%) were male and the median age was 31 years. At the index VL diagnosis, 110 (75%) had primary VL, 57 (40%) were on antiretroviral therapy (ART), and the median CD4 count was 149 cells/µL. The median follow-up time after cure was 11 months, during which 44 (30%) patients relapsed. The risk of relapse was 15% at 6 months, 26% at 12 months, and 35% at 24 months. Predictors of relapse were: not being on ART at VL diagnosis, ART not initiated during VL treatment, and high tissue parasite load (parasite grade 6+) at VL diagnosis. CONCLUSIONS: The risk of VL relapse in coinfected patients was high, particularly in those not on ART or presenting with a high tissue parasite load. These patients should be preferentially targeted for secondary prophylaxis and/or regular medical follow-up. Timely ART initiation in all coinfected patients is crucial.


Assuntos
Coinfecção , Infecções por HIV , Leishmaniose Visceral , Adulto , Contagem de Linfócito CD4 , Coinfecção/complicações , Coinfecção/epidemiologia , Etiópia/epidemiologia , Feminino , Infecções por HIV/complicações , Infecções por HIV/epidemiologia , Infecções por HIV/imunologia , Humanos , Estimativa de Kaplan-Meier , Leishmaniose Visceral/complicações , Leishmaniose Visceral/epidemiologia , Leishmaniose Visceral/imunologia , Masculino , Recidiva , Estudos Retrospectivos , Fatores de Risco
20.
Trop Med Int Health ; 22(10): 1293-1301, 2017 10.
Artigo em Inglês | MEDLINE | ID: mdl-28712122

RESUMO

OBJECTIVE: Cutaneous leishmaniasis (CL) receives far less attention than visceral leishmaniasis. Nevertheless, CL is predominantly caused by a unique species in Ethiopia (L. aethiopica), which is known to cause severe forms such as diffuse (DCL) and mucocutaneous leishmaniasis (MCL). We report on the number and type of CL cases diagnosed, the clinical features, the treatments and treatment outcomes in North-West Ethiopia. METHODS: This is a retrospective chart record analysis of CL patients treated at the Leishmania Research and Treatment Center (LRTC) of the University of Gondar, Ethiopia. RESULTS: From 178 CL patients seen between January 2014 and December 2015, a total of 154 chart records were retrieved. These included 80 localised CL (LCL), 7 DCL and 67 MCL. The median age was 23 years; 71.4% were male. Most (n = 121, 78.6%) of the lesions were on the face. The median time since onset was 12 months (6-24 months), and 28.6% presented after a trial of traditional medicine. The treatment of all forms of CL mainly consisted of 30 days of IM antimonial injections. Of these, 51/133 (38.3%) required treatment extension or change due to nonresponse. Three cases were treated with liposomal amphotericin B or miltefosine (two received the combination), of which two responded well. CONCLUSION: CL was found to be complicated and difficult to treat. MCL was common, and patients presented after long delays. There is an urgent need to look for better treatment options for CL and improve access to care.


Assuntos
Antiprotozoários/uso terapêutico , Crioterapia/métodos , Leishmaniose Cutânea/epidemiologia , Adolescente , Adulto , Criança , Etiópia/epidemiologia , Feminino , Humanos , Leishmania/classificação , Leishmania/isolamento & purificação , Leishmaniose Cutânea/parasitologia , Leishmaniose Cutânea/patologia , Leishmaniose Cutânea/terapia , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Resultado do Tratamento , Adulto Jovem
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