Stratégie vaccinale et diagnostic du VIH dans les pays à ressources limitées (éctude de la réponse TCD8 anti-VIH croisée et évaluation de techniques alternatives de diagnostic des personnes vivant avec le VIH en Côte d'Ivoire)

PARIS7-Bibliothèque centrale (751132105) / SudocSudocFranceF

Stratégie vaccinale et diagnostic du VIH dans les pays à ressources limitées (éctude de la réponse TCD8 anti-VIH croisée et évaluation de techniques alternatives de diagnostic des personnes vivant avec le VIH en Côte d'Ivoire)

PARIS7-Bibliothèque centrale (751132105) / SudocSudocFranceF

Anthropometric and immunological success of antiretroviral therapy and prediction of virological success in west African adults.: Predictors of virological success of ART in Abidjan

International audienceOBJECTIVE: The 6 month assessment of the response to antiretroviral therapy (ART) is a critical step. In sub-Saharan Africa, few people have access to plasma viral-load measurement. We assessed the gain or loss in body mass index (BMI), alone or in combination with the gain or loss in CD4+ T-cell count (CD4), as a tool for predicting the response to ART. METHODS: In a cohort of 622 adults in Abidjan, C?d'Ivoire, we calculated the sensitivity, specificity and predictive values of BMI and CD4 for treatment success defined as viral-load undetectability (< 300 copies/ml) as gold standard. FINDINGS: After 6 months of ART, the median change in BMI was an increase of 1.0 kg/m(2) (interquartile range, IQR: 0.0-2.1), the median change in CD4 an increase of 148/ml (IQR: 54-230) and 84% of patients reached viral-load undetectability. The distribution of change in BMI was similar among patients who reached undetectability and those who did not (increases of 1.06 kg/m(2) versus 0.99 kg/m(2), P = 0.51). With larger changes in BMI, the specificity for treatment success increased but its sensitivity decreased and its positive predictive value was stable around 85%. All results remained similar when combining changes in BMI with those in CD4 and when stratifying by groups of baseline BMI or CD4. CONCLUSION: In settings where viral-load measurement is not available, a high BMI gain does not reflect virological success, even when combined with a high CD4 gain. In our population, most patients with detectable viral-load had probably adhered to the drug regimen sufficiently to reach significant gains in body mass and CD4 count but had adhered insufficiently to reach viral suppression

Variation of CD4 Count and Percentage during Pregnancy and after Delivery: Implications for HAART Initiation in Resource-Limited Settings.

International audienceWe studied whether the use of T-lymphocyte CD4 (CD4) absolute count instead of CD4 percentage could affect the decision process regarding HAART initiation in African HIV-infected pregnant women. A prospective cohort in Abidjan, C?d'Ivoire before HAART was available. Participating women received a perinatal antiretroviral prophylaxis (zidovudine + single-dose of nevirapine). CD4 count and percentage were measured by flow cytometry at baseline (32 weeks of amenorrhea) and at 1 month after delivery. A signed-rank test was used to compare the distributions of the CD4 absolute count and percentage values. A total of 325 HIV-1-infected pregnant women were included. At baseline, their median CD4 count was 355 cells/mm(3) and the median CD4 percentage was 24.8%; 17.8% of women had a CD4 count <200 cells/mm(3) and 14.8 % had a CD4 percentage <15%. One month after delivery, the median CD4 count was 489 cells/mm(3) (vs. baseline: p < 0.001), the median CD4 percentage was 25.6% (vs. baseline: p = 0.107), 9.5% of women had CD4 count <200 cells/mm(3) (vs. baseline: p < 0.001), and 15.1% of women had a CD4 percentage <15% (vs. baseline: p = 0.823). When combining the CD4 count and the WHO clinical stage, the proportion of women who met the WHO 2006 criteria for initiating HAART was 28.3% at baseline but 17.2% only at 1 month after delivery (p < 0.001). Between the prepregnancy and the postdelivery periods, the CD4 count experienced a significant increase, whereas the CD4 percentage remained unchanged. To accurately target the most appropriate time to start HAART, the CD4 percentage could be more reliable than the absolute count in sub-Saharan African pregnant women

Field Evaluation of a Rapid Human Immunodeficiency Virus (HIV) Serial Serologic Testing Algorithm for Diagnosis and Differentiation of HIV Type 1 (HIV-1), HIV-2, and Dual HIV-1-HIV-2 Infections in West African Pregnant Women

We evaluated a two-rapid-test serial algorithm using the Determine and Genie II rapid assays, performed on-site in four peripheral laboratories during the French Agence Nationale de Recherches sur le SIDA (ANRS) 1201/1202 Ditrame Plus cohort developed for prevention of mother-to-child transmission of human immunodeficiency virus (HIV) infection in Côte d'Ivoire. A total of 1,039 specimens were retested by two commercial enzyme-linked immunosorbent assays (ELISAs). The following specimens were tested: 315 specimens found on-site to be infected with HIV type 1 (HIV-1), 8 specimens found on-site to be infected with HIV-2, 71 specimens found on-site to be infected with both HIV-1 and HIV-2, 40 specimens found on-site to have indeterminate results for HIV infection, and 605 specimens taken during a quality assurance program. For HIV discrimination, 99 positive serum samples (20 with HIV-1, 8 with HIV-2, and 71 with HIV-1 and HIV-2 on the basis of our rapid test algorithm) were retested by the Peptilav test, Western blot (WB) assays, and homemade monospecific ELISAs. Real-time DNA PCRs for the detection of HIV-1 and HIV-2 were performed with peripheral blood mononuclear cells from 35 women diagnosed on-site with HIV-1 and HIV-2 infections. Compared to the results of the ELISAs, the sensitivities of the Determine and Genie II assays were 100% (95% lower limit [95% LL], 99.1%) and 99.5% (95% confidence interval [95% CI], 98.2 to 99.9%), respectively. The specificities were 98.4% (95% CI, 96.9 to 99.3%) and 100% (95% LL, 99.3%), respectively. All serological assays gave concordant results for infections with single types. By contrast, for samples found to be infected with dual HIV types by the Genie II assay, dual reactivity was detected for only 37 samples (52.1%) by WB assays, 34 samples (47.9%) by the Peptilav assay, and 23 samples (32.4%) by the monospecific ELISAs. For specimens with dual reactivity by the Genie II assay, the rates of concordance between the real-time PCR assays and the serological assays were 25.7% for the Genie II assay, 82.9% for the Peptilav assay, 74.3% for WB assays, and 80% for the homemade ELISAs. Our algorithm provided high degrees of sensitivity and specificity comparable to those of ELISAs. Even if they are rare, women identified by the Genie II assay as being infected with HIV-1 and HIV-2 mostly appeared to be infected only with HIV-2

Hepatitis B treatment eligibility in West Africa: uncertainties and need for prospective cohort studies.

BACKGROUND & AIMS While universal screening of hepatitis B virus (HBV) is recommended in high burden countries, little is known about the proportion of HBV-infected persons in need of antiviral therapy in these settings. METHODS Prisoners in Senegal and Togo, as well as female sex workers and men who have sex with men in Cote d'Ivoire were screened for HBV infection. All HBsAg-positive participants underwent transient elastography, alanine aminotransferase (ALT) and HBV viral load quantification. Individuals with liver cirrhosis or those aged>30 years with an HBV replication ≥20 000 IU/ml and elevated ALT were considered eligible for antiviral therapy. RESULTS Of 1 256 participants, 110 (8.8%) were HBsAg-positive; their median age was 30 years [interquartile range: 25-33] and 96 (86.5%) were men. Three individuals (2.7%) had liver cirrhosis while 28 (29.5%) of 94 participants with available measurements had an HBV viral load ≥20 000 IU/ml. Overall, 11 (10.0%) subjects were considered eligible for immediate antiviral treatment; 2.1% of participants in Dakar, 7.7% in Abidjan and 21.6% in Lome (p=0.001) and 59 (53.4%) for close monitoring due to the presence of significant liver fibrosis, elevated ALT or significant HBV replication. CONCLUSIONS Among vulnerable populations in West Africa, a minority of HBV-infected individuals were eligible for immediate antiviral therapy. Prospective cohort studies are necessary to evaluate anti-HBV treatment eligibility facing the significant proportion of individuals with active chronic HBV infection. This article is protected by copyright. All rights reserved

Comparison of early CD4 T-cell count in HIV-1 seroconverters in Côte d'Ivoire and France: the ANRS PRIMO-CI and SEROCO cohorts.

International audienceOBJECTIVE: We compared CD4+ decline among untreated HIV-1-infected seroconverters living in Côte d'Ivoire (CI) and in France. METHODS: HIV-1-infected adults were enrolled in the ANRS1220 PRIMO-CI (CI, 1997-2006) and ANRSCO2 SEROCO (France, 1988-1995) cohorts. CD4+ count and percentage declines were estimated from enrollment until 24 months of seroconversion by linear random-effect models adjusted for time since seroconversion, age, gender, cell-associated HIV DNA, HIV RNA, and country. RESULTS: Overall 521 seroconverters (CI 148, 62% men; France 373, 77% men) were enrolled after a median of 7.6 months since seroconversion. Median follow-up duration was 12.7 months. Median age was 28 years. Median baseline CD4+ count was 472 and 560 cells per cubic millimeter, respectively. Median baseline HIV RNA was 4.4 and 4.0 log10 copies per milliliter and median HIV DNA was 3.0 and 2.8 log10 copies per 10(6) peripheral blood mononuclear cells, respectively. In adjusted models, CD4+ count and percentage at baseline were lower in CI than in France (P < 0.01), and the difference did not vary during follow-up (P = 0.55). Low HIV RNA and low HIV DNA at baseline were associated with higher CD4+ count at baseline. CONCLUSIONS: CD4+ count and percentage were lower in CI than in France. These differences were already observed during early infection and remained similar after adjustment

Morbidity before and after HAART initiation in Sub-Saharan African HIV-infected adults: a recurrent event analysis.: HIV morbidity recurrence in Abidjan

International audienceThe incidence and determinants of severe morbidity recurrence in sub-Saharan African HIV-infected adults on antiretroviral therapy (ART) have never been reported. In a prospective cohort study of HIV-infected adults in Abidjan the association of severe morbidity occurrence and recurrence with follow-up CD4 counts and ART on/off status was analyzed by means of multivariate failure analysis for recurrent events (Prentice, Williams, and Peterson model). A total of 608 patients (median CD4 290/mm3 ) was followed off ART for 1824 person-years (PY). Of these 187 started HAART (median CD4 174/mm3 ) and were followed for 328 PY. The incidence of first, second, and third severe morbidity events was 40.6/100 PY, 68.4/100 PY, and 93.9/100 PY during the off-ART period, and 28.4/100 PY, 39.4/100 PY, and 37.6/100 PY during the on-ART period, respectively. The rates of recurrences were higher than the rates of first episodes for almost all diseases, even after stratifying by CD4 count and by ART on/off status. In multivariate analysis, the time-updated CD4 count was independently associated with increasing rates of morbidity first events and recurrences, after adjustment on other covariates (p > 10(4) ). By contrast, there was no association between the ART on/off status and the morbidity rates after adjustment for CD4 count (p = 0.37). Introducing ART led to a clear reduction in morbidity, mainly related to the ART-induced increase in CD4 count. In HIV-infected patients on ART, the incidence of severe morbidity varied with the past history of morbidity. The past history of morbidity should be taken into account when comparing HIV morbidity rates before and after ART initiation