Scholarly works in Virology

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    Prevalence of hepatitis b virus (HBV) basal core promoter/precore region molecular variants among HIV/HBV co-infected and HBV mono-infected patients in Ile-Ife, Nigeria
    (Medwin Publishers, 2021) Osasona, O. G.; Boudarene, L.; Fasoro, O. A.; George, U. E.; Oguzie, J.; Ariyo, O. E.; Olumade, T. J.; Adeniyi, A.; Adewumi, O. M.; Adeniji, J. A
    Introduction: Evolution of phenotypic diversity among viruses occurs as an escape mechanism against host immune pressure or drug selective pressure. Among HIV/HBV co-infected individuals, various HBV basal core promoter (BCP)/precore (PC) region molecular mutants had been reported with associated phenotypic defect in HBeAg production. The emergence of HBeAg negative variants of HBV in HIV co-infected individuals have profound implication on the diagnosis, management and prognosis of this subset of individuals. This includes delayed clearance of HBV, early development of adverse hepatic events such as liver cirrhosis and hepatocellular carcinoma. Currently, little is known about HBV BCP/PC region genomic heterogeneity in HIV/HBV co-infected patients in Nigeria. Therefore, this study was focused on investigating evidence of precore/core region genomic variability among HIV/HBV co-infected patients in Nigeria. Materials and Methods: A total of 40 patients (20 HIV/HBV co-infected and 20 HBV mono-infected samples) were enrolled into the study and subsequently tested for HBsAg, HBeAg and HBeAb using specific Enzyme-Linked Immunosorbent Assay (ELISA). The BCP/PC genome regions (nucleotides 1653-1959) were amplified using a nested PCR assay and then subjected to BCP/PC mutational analysis in genome sites affecting HBeAg expression especially at the BCP transcriptional and PC Translational stop codon sites. Results: Overall, 5 (83.3%) of the six exploitable sequences after analysis showed various BCP/PC mutations. Only 1(16.6%) sequence from an HIV/HBV co-infected patient had the BCP transcriptional (double mutation; A1762T/G1764A) mutant. Analysis of the PC translational stop codon showed 4 (66.6%) having the G1896A mutants while 33.3% (2) had G1899A mutants. Conclusion: This study has broadened the available evidence of BCP/PC region molecular mutants among HIV/HBV coinfected patients in Nigeria and assessed the difference of mutation prevalence in comparison with HBV mono-infected cohort.
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    Evaluation of CD4 T lymphocyte cell Levels among Hepatitis B, C and E Viruses negative individuals in Ibadan, Southwestern Nigeria
    (SCIENCEDOMAIN International, 2017) Adewumi, M. O .; Omoruyi, E. C.; Ifeorah, I. M.; Bakarey, A. S.; Ogunwale, A. O.; Akere, A.; Faleye, T. O. C.; Adeniji, J.A.
    Aim: The CD4 T lymphocytes play a key role in achieving a regulated effective immune response to foreign antigens. It is also a valuable parameter for assessing HIV disease progression. However, variations in CD4 T lymphocyte values due to diverse factors have been reported. Here we evaluated CD4 T lymphocytes among community dwellers who tested negative for hepatitis B, hepatitis C and hepatitis E viruses and compared the results with the National Reference Values (NRVs).Study Design: A cross-sectional study was conducted. Participants were enrolled using a convenient sampling technique and their socio-demographic characteristics were captured by administration of semi-structured questionnaires. Place and Duration of Study: This study was conducted among residents of Ibadan metropolis, Southwestern Nigeria. Participants were enrolled between July and September, 2013 at the University College Hospital, Ibadan. Methodology: Four hundred consenting participants who fulfilled the criteria for enrolment were evaluated for CD4 T lymphocyte counts. Results: Estimated mean CD4 T lymphocyte count of 1,183 (CD4 Range: 328-2680) cells/μl of blood was recorded for the participants. Four (1.0%), 151 (37.8%), 157 (39.2%), 74 (18.5), and 14(3.5) of the participants had CD4 T lymphocyte count ranged 352-500, 501-1,000, 1,001-1500, 1501-2,000, and >2,000 cells/μl of blood, respectively. Differences in the estimated mean CD4 count between different age groups varied significantly (P=0.010).Conclusion: In this study, significantly higher CD4 T lymphocyte values were observed among the study population in comparison to the NRVs, and consequently we advise careful interpretation and use of extrapolated CD4 T lymphocyte values in the management of persons with diverse geographical background or health conditions.
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    HBV Infection among HIV-infected cohort And HIV-negative Hospital attendees in South Western Nigeria
    (African Network for Infectious Diseases (ANID), 2014) Adewumi, M. O.; Donbraye, E.; Odaibo, G. N.; Bakarey, A. S.; Opaleye, O. O.; Olaleye, D. O.
    "Background: Prevalence, association and probable mode of acquisition of HBV and HIV dual infections have not been fully explored. Thus, HBV intervention plan and services are sometimes exclusively targeted towards HIV-infected population. We investigated HBV infection among HIV-infected cohort in comparison with HIV-negative hospital attendees to ascertain dual infectivity pattern; thereby encouraging appropriat allotment of intervention services. A total of 349 (M=141; F=208; Mean=33.98 years; Range= 0.33-80 years) plasma specimens from two virus diagnostic laboratories in south-western Nigeria were analysed. These include 182 HIV-positive and 167 HIV-negative specimens from ART and GDV laboratories respectively. The specimens were initially screened for detectable HIV antigen/antibody, and subsequently HBsAg by ELISA technique. Overall, HBsAg was detected in 20.92% (95% CI: 16.65-25.19%) of the patients. Also, 24.82% (95% CI: 17.69 31.95%) and 18.27% (95% CI: 13.02-23.52%) HBsAg positivity was recorded for males and females respectively. CHI square analysis showed no association (P=0.14) between gender and prevalence of HBsAg. Similarly, comparison of prevalence of HBsAg by age groups shows no significant difference (P=0.24). Overall, no significant difference (P=0.59) was observed in the prevalence of HBsAg among the HIV-infected cohort and HIV-negative hospital attendees. Results of the study confirm endemicity and comparable rates of HBV infection independent of HIV-status.
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    Traditional crop farmers in Kogi East, Nigeria elucidate elevated HIV and AIDS prevalence level during a five -year study period
    (Academic Journals (Academic Journals Inc., Lagos, Nigeria), 2009) Sule, W. F.; Enemuor, S. C.; Adewumi, M. O.; Attah, O. C.
    The United Nations reported that HIV and AIDS have negative impact upon agriculture and increasing hunger in sub-Saharan Africa. Such a situation is postulated to synonymously occur in Nigeria. This study therefore, aimed to investigate the prevalence level of HIV antibodies and AIDS among traditional crop farmers and non-farmers comprising traders, drivers, teachers and students in Kogi East. This is one of the primary agricultural areas of Kogi State, Nigeria and is therefore of great importance to perform an assessment depicting the prevalence of local HIV infection. Documented records of HIV antibody screening from the year 2002 to 2006 at the Voluntary Counselling and HIV Testing Unit of General Hospital, Ankpa, Kogi East were reviewed. Selected data was statistically analyzed with Chi2 - test using SPSS 13.0. A total of 11,077 patients from the ages of two months to 72 years were screened during the five years. Of this, 2,510 HIV positive cases (overall prevalence of 22.70%; mean = 21.86%; n= 5; standard deviation [SD] = 5.64%) and 322 mean = 12.47%; n = 5; SD = 2.23%) AIDS-related deaths were documented. The letter group included 250 (77.6%, mean = 71.91%; SD = 15.72%) farmers. A significant higher number of farmers were seropositive (_2 = 72.710; p = 0.001, df = 1, _ = 0.05) and died (_2 = 93.255; p = 0.001, df = 1, _ = 0.05) of AIDS-related illness compared to the non-farmers. The ages of people that died range from 12 to 49 years (n = 322) with a mean age of 44.1 years. Throughout the specified five years sampling duration, more non-farmers than farmers partook in HIV antibody screening. Farmers that were seropositive for HIV antibodies and died of AIDS-related illness were significantly higher in proportion than the non-farmers.
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    Reliability of testing and potential impact on HIV prevention in Nigeria
    (Medical and Dental Consultants Association of Nigeria (MDCAN), 2006) Odaibo, G. N; Donbraye, E.; Adewumi, M. O.; Bakarey, A. S.; Ibeh, M. A.; Olalcye, D. O.
    Several factors including variability of human immunodeficiency virus (HIV), laboratory facilities, cost and competence of personnel handling the tests are some of the important factors that affect accuracy and reliability of HIV testing in most parts of Africa. Recently investigators in Africa have observed that antibody detection assays based on antigens derived from HIV-1 subtype B show moderate to significantly lower sensitivity for detection of infection by various non-B subtypes. In this study, we evaluated the reliability of two El A and 12 rapid HIV-1/2 test kits that are commercially available in Nigeria using the Western immune blotting technique as reference. A panel of 100 sera from Western blot confirmed symptomatic or asymptomatic HIV-1 infected persons and 90 seronegative patients from those referred for testing in our laboratory were used for this study. Each sample was tested with two HIV-1/2 EIA, and 12 HIV-1/2 rapid test kits commercially available at one time or the other for HIV-1/2 testing in Nigeria. Overall, the sensitivity of the two EIA kits were 100% and 91.0% with specificity of 96.7% and 91.1% respectively. The sensitivity of the rapid test kits ranged from 88% to 98.0% with specificity of 92.2% to 100%. Further analysis showed significant variation in the sensitivity and specificity of the same kit based on whether an individual had asymptomatic or symptomatic infection the results of this study highlight the problem of diagnosis of HIV infections in Africa. It shows that the sensitivity of most of the rapid assays shall not be adequate for detection of early infection. The implications of possible misdiagnosis on the various intervention strategies that rely predominantly on correct HIV status of an individual are enormous. Thus, there is an urgent need for review of the current HIV testing assays or algorithms in Nigeria and other parts of Africa.
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    Prevalence of hepatitis B virus and C seropositivity in a Nigerian cohort of HIV-infected patients
    (2008) Otegbayo, J. A.; Taiwo, B. O.; Akingbola, T. S.; Odaibo, G. N.; Adedapo, K. S.; Penugonda, S.; Adewole, I. F.; Olaleye, D. O.; Murphy, R.; Kanki, P.
    "INTRODUCTION:The clinical and public health implications of the convergence of the human immunodeficiency virus (HIV) epidemic and chronic viral hepatitis in sub-Saharan Africa are poorly understood. This study was designed to determine the seroprevalence of hepatitis B virus (HBV) and hepatitis C virus (HCV), and the impact of co-infection on baseline serum alanine transaminase (ALT), CD4+ T lymphocyte (CD4) count, and plasma HIV-RNA (viral load) in a cohort of HIV-infected Nigerians. METHODS:A retrospective study was conducted, on eligible treatment-naive patients who presented between August 2004 and February 2007 to the University College Hospital (UCH), Ibadan, Nigeria. Demographic data and pre-treatment laboratory results (hepatitis B surface antigen (HBsAg), HCV antibodies (anti-HCV), ALT, CD4 count and viral load) were retrieved from the medical records. Fisher's exact, two sample t-tests, and the Wilcoxon rank sum tests were used to compare groups. A logistic regression model was fitted to explore characteristics associated with co-infection status. RESULTS:A total of 1779 HIV-infected patients (male: female ratio, 1:2) met inclusion criteria. HBsAg was present in 11.9%, anti-HCV in 4.8% and both markers in 1%. HBsAg was more common among males than females (15.4% vs 10.1%, respectively p = 0.001) while anti-HCV was detected in a similar proportion of males and females (5.3% versus 4.6%, respectively p = 0.559). HIV-infected patients with anti-HCV alone had a lower mean baseline CD4 count compared to those without anti-HCV or HBsAg (197 cells/mm3 vs 247 cells/mm3, respectively p = 0.008). Serum ALT was higher among patients with HBsAg compared to those without HBsAg or anti-HCV (43 International Units (IU) vs. 39 IU, respectively p = 0.015). Male gender was associated with HBV co-infection on logistic regression (OR1.786; 95% CI, 1.306-2.443; p < 0.005). CONCLUSION:More HIV-infected females than males presented for care in this cohort. We identified a relatively high prevalence of HBV and HCV co-infection in general, and a higher rate of HBV co-infection among males than females. Pre-treatment CD4 count was significantly lower among those with HCV co-infection, while ALT was slightly higher among those with HBV co-infection. Triple infection with HIV, HBV and HCV was present in a small but significant proportion of patients. These findings underscore the importance of testing for HBV and HCV in all HIV-infected persons in our setting."