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Seroprevalence of parvovirus B19 antibodies and evidence of viremia among Nigerian patients with sickle cell anemia

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The Journal of Biomedical Research 2013年第4期27卷 272-282页

作者： Bamidele Abiodun iwalokun senapon olusola iwalokun Semande Olufunmilayo Hodonu Biochemistry and Nutrition Nigerian Institute of Medical Research Maternal and Child Health Unit Iru/VI Primary Health Centre (PHC) Department ofBiochemistry Lagos State University

Clinical, biochemical and molecular evidence for the sickle cell anemia （SCA） crisis in Nigerian patients arising from parvovirus b19 infection remains inadequate. This study determined the prevalence and correlates of antiparvovirus b19 antibodies in a population of SCA patients and non-SCA healthy controls in Lagos, Nigeria. In this prospective cross-sectional study, we enrolled 73 confirmed SCA patients from 5 district hospitals in Lagos and 81 sex and age-matched non-SCA healthy controls. Serum sample from each study participant was screened for anti-parvovirus b19 by ELISA and PCR techniques. Standard biomedical assays were also done. Anti-parvovirus b19 IgM and IgG antibodies were detected in 22 （14.3%） and 97 （62.9%） of the 154 sera screened, 13 （17.8%） and 45 （61.6%） in SCA patients; 9 （11.1%） and 52 （64.2%） in non-SCA controls. The overall seronegativity rate was 19.5%. Parvovirus B19 DNA was found in 2 （11.1%） of the 18 IgM seropositive SCA serum samples screened. On the whole, parvovirus b19 infection was more commonly asymptomatic in non-SCA controls but caused significant elevation in liver enzymes in infected SCA patients （P 〈 0.05）. The risk of acute parvovirus b19 infection increased 65 times during unsteady state among the SCA patients. Although no deaths of infected patients were recorded during the study, age below 12 years, hospitalization and overcrowded environment were risk factors for infection. We conclude that parvovirus b19 is common in SCA patients, incurring greater susceptibility to infections.

关键词： parvovirus b19 infection seroprevalence sickle cell anemia

Are Drug Efflux Genes Present among <i>Mycobacterium tuberculosis</i>Isolates from Patients in Lagos, Nigeria?

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Journal of Biosciences and Medicines 2020年第11期8卷 86-98页

作者： Toyosi Yekeen Raheem Bamidele iwalokun Muinah Fowora Adesegun Adesesan Afolabi Oluwadun Molecular Biology and Biotechnology Department Nigerian Institute of Medical Research Yaba Nigeria Microbiology Department Olabisi Onabanjo University Ago-Iwoye Nigeria Centre for Tuberculosis Research Microbiology Department Nigerian Institute of Medical Research Yaba Nigeria

A major challenge in the treatment of Tuberculosis (TB) is emergence of Multi-Drug Resistant Mycobacterium tuberculosis (MDRTB) strains. Efflux genes have been established to be among factors for drug resistance in Mycobacterium tuberculosis (M. tuberculosis) pulmonary infections by conferring bacterial ability to pump-out drugs from intracellular compartment, making it impossible for drugs to attain intracellular concentration lethal to the organism. There is paucity of data on the role of efflux pump in MDRTB in Nigerian strains of M. tuberculosis. Hence, the aim of this study was to detect the carriage, distribution and frequency of efflux pump genes among MDRTB and non-MDRTB isolates from participants with pulmonary tuberculosis in Lagos, Nigeria. This study was carried out on M. tuberculosis isolated from 1020 participants suspected of pulmonary tuberculosis in Lagos State, Nigeria. A total of 78 M. tuberculosis isolates were obtained from the participants suspected of pulmonary tuberculosis. Forty Eight isolates were confirmed as MDRTB and 30 non-MDRTB. Efflux pump genes were investigated in the isolates using the conventional polymerase chain reaction. Statistical analysis was carried out using the Statistical Package for Social Science (SPSS version 20) to compare the efflux pump gene results between MDRTB and non- MDRTB isolates. Different efflux genes types and frequency were detected in MDRTB and non-MDRTB isolates. Carriage of 2 or more alleles of efflux gene types Rv2486c (efpA), Rv2459c (jefA), Rv1877, Rv1002c, Rv0342, Rv2686c and drrC associated with MDR were detected. Additionally, the frequency of efflux genes alleles in MDRTB was significantly different from those in non- MDRTB isolates.

关键词： Efflux Genes Alleles Mutations MDR MDRTB Non-MDRTB DOTs Lagos State Nigeria

Identification and Antibiotic Resistance Profile of Uropathogenic Bacteria from Sexually Active Women with Bacterial Vaginosis

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Journal of Biosciences and Medicines 2021年第11期9卷 52-67页

作者： Chinedum Taahie Oparaugo Bamidele Abiodun iwalokun Adesegun Abiola Adesesan Idowu Olaide Edu-Muyideen Abimbola Modupe Adedeji Oliver Chukwujekwu Ezechi Mopelola Anotu Deji-Agboola Biochemistry & Nutrition Department Nigerian Institute of Medical Research Lagos Nigeria Department of Medical Microbiology & Parasitology Olabisi Onabanjo University Ago-Iwoye Nigeria Molecular Biology & Biotechnology Department Nigerian Institute of Medical Research Lagos Nigeria Central Research Laboratory Nigerian Institute of Medical Research Lagos Nigeria Microbiology Department Nigerian Institute of Medical Research Lagos Nigeria Monitoring & Evaluation Unit Nigerian Institute of Medical Research Lagos Nigeria Clinical Science Department Nigerian Institute of Medical Research Lagos Nigeria

Background: Urinary tract infections (UTIs) in women with bacterial vaginosis (BV) continue to pose tremendous health concerns and require appropriate use of antibiotics for effective case management. This study determined the prevalence, etiology and antibiotic resistance profile of uropathogenic bacteria isolated from sexually active women with BV in Lagos Nigeria. Method: A total of 258 sexually active women presenting with gynaecological complaints at the maternal and child unit of twenty Primary Health Care Centres in Lagos Nigeria from May 2017 to March 2018 were consecutively enrolled with consent. Bacterial vaginosis was diagnosed based on Amsel criteria. Midstream urine samples were collected aseptically, analyzed for bacterial pathogens and antibiotic susceptibility using standard microbiological methods. Results: BV was diagnosed in 184 (71.3%) with 69.2% also having UTI. Ninety four (36.4%) had UTI predominantly caused by Gram negative bacteria (96.8%). The organisms isolated were Escherichia coli 79 (84.0%), Klebsiella pneumoniae 5 (5.3%), Pseudomonas aeruginosa 4 (4.3%), Proteus mirabilis 3 (3.2%) and Staphylococcus saprophyticus 3 (3.2%). The pathogens elicited high resistance (66.7% - 100%) to tetracycline, amoxicillin-clavulanic acid, nitrofurantoin and cephalosporins, and moderate resistance (50%) to ofloxacin by P. aeruginosa strains. The isolates were susceptible (100%) to piperacillin-tazobactam and meropenem. Multi-drug resistance (MDR) was observed among 97.8% of the bacteria isolated. Conclusion: Findings from this study indicate high occurrence of UTI caused by MDR pathogens among sexually active women with BV with emerging evidence of poor clinical utility of nitrofurantoin and other commonly used first-line antibiotics against UTI. Further studies on non-bacterial aetiology of BV, molecular characterization of S. sa

关键词： Urinary Pathogens Antibiotics Susceptibility Bacterial Vaginosis Women

Occurrence and Clinical Characteristics of Vaginitis among Women of Reproductive Age in Lagos, Nigeria

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Advances in Reproductive Sciences 2022年第4期10卷 91-105页

作者： Chinedum Taahie Oparaugo Bamidele Abiodun iwalokun Francisca Obiageri Nwaokorie Nathaniel Adeleke Okunloye Adesegun Abiola Adesesan Idowu Olaide Edu-Muyideen Abimbola Modupe Adedeji Oliver Chukwujekwu Ezechi Mopelola Anotu Deji-Agboola Biochemistry & Nutrition Department Nigerian Institute of Medical Research Lagos Nigeria Department of Medical Microbiology & Parasitology Olabisi Onabanjo University Ago-Iwoye Nigeria Molecular Biology & Biotechnology Department Nigerian Institute of Medical Research Lagos Nigeria Central Research Laboratory Nigerian Institute of Medical Research Lagos Nigeria Department of Medical Laboratory Science College of Medicine University of Lagos Idi-Araba Lagos Nigeria Department of Biochemistry Faculty of Basic Medical Sciences College of Health Sciences Ladoke Akintola University of Technology Ogbomoso Nigeria Microbiology Department Nigerian Institute of Medical Research Lagos Nigeria Monitoring & Evaluation Unit Nigerian Institute of Medical Research Lagos Nigeria Clinical Science Department Nigerian Institute of Medical Research Lagos Nigeria

Background: Vaginitis is an important public health problem globally. It is associated with gynaecological and obstetric complications. Vulvovaginal candidiasis, bacterial vaginosis and trichomoniasis are mainly responsible for vaginitis. The aim of this study is to determine the occurrence, clinical characteristics and associated risk factors of vulvovaginal candidiasis and bacterial vaginosis among women of reproductive age attending Primary Health Care centres in Lagos Nigeria. Methods:This cross-sectional study recruited 258 women with genital complaints after obtaining their informed written consent between May 2017 and March 2018. Structured questionnaires were administered and high vaginal swabs were collected for laboratory examination. The results were analysed with descriptive statistics, chi-square and simple logistic regression. Results: Out of the 210 (81.4%) of the women with one or more vaginal infections, 105 (50.0%), 26 (12.4%) had bacterial vaginosis, and vulvovaginal candidiasis respectively while 78 (37.1%) had both vulvovaginal candidiasis and bacterial vaginosis. Only 1 (0.5%) participant had trichomoniasis and bacterial vaginosis. History of abortion and age below 25 years were associated with vulvovaginal candidiasis while pregnancy, history of miscarriage, age at first sexual activity and discharge were associated with bacterial vaginosis. Itching was associated with both vulvovaginal candidiasis and bacterial vaginosis. Conclusion: This study revealed vulvovaginal candidiasis and bacterial vaginosis as important cause of genital complaints among reproductive age women in Lagos. Health education, robust diagnosis and early treatment are needed in order to reduce the associated risk factors, disease burden and complications.

关键词： Vaginitis Women Reproductive Age

Antimicrobial Resistance and Plasmid Profiles of <i>Salmonella enterica</i>Serovars from Different Sources in Lagos, Nigeria

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Health 2018年第6期10卷 758-772页

作者： K. O. Akinyemi S. O. Ajoseh B. A. iwalokun A. O. B. Oyefolu C. O. Fakorede R. O. Abegunrin O. Adunmo Department of Microbiology Lagos State University Ojo Lagos Nigeria Biochemistry Unit and Malaria Research Laboratory Nigerian Institute of Medical Research Yaba Lagos Nigeria

Introduction: Salmonella enterica Serovars remains one of the leading pathogens that cause diarrhoea and bloodstream infections in developing countries. The emergence of multidrug resistant (MDR) Salmonella has become a serious problem globally. This study investigated the antibiotic resistance and plasmid profiles of Salmonella isolates from different sources. Methods: Seventy-three samples comprised of clinical (30), hand swab (15), food (10) and water (18) were analyzed bacteriologically. Salmonella isolates were identified and characterized by standard procedures. Isolates were subjected to antimicrobial susceptibility testing and were further screened for plasmid DNA by standard methods. Results: A total of 27 Salmonella isolates made up of 5 (18.5%) S. typhi, 6 (22.2%) S. enteritidis, 9 (33.3) S. typhimurium, 5 (18.5%) S. cholerasuis, and 1 (3.7%) each of *** and S. vichow were obtained in this study. All the isolates developed resistance to three or more antibiotics evaluated. Four distinct resistance profiles: TetAmpCol, TetAmpColCot, TetAmpColCip and TetAmpColCotCip were recorded with 63% of the isolates exhibiting resistance profile TetAmpColCot. Specifically 23 of 27 (85.2%) of the isolates harboured plasmid DNA comprised of 12 distinct plasmid profiles of different sizes ranging from 3.2 kb to 30.2kb. Salmonella isolates of the same species from different sources differed in plasmid profile. Plasmid profile was found to show good discriminatory capability compared to antibiotics resistance profile. Conclusion: This study revealed that both resistance antibiogram and plasmid profile are still viable epidemiological tools for tracing the source of Salmonella isolates. A need for prudent use of antibiotics is suggested.

关键词： Salmonella Resistant Antibiogram Plasmid Epidemiology Disease