BackgroundHepatitis B virus (HBV) transmission through blood transfusion is reduced by screening for hepatitis B surface antigen (HBsAg). However this method cannot detect the presence of occult hepatitis B virus infection. This study sought to determine the prevalence of occult hepatitis B virus infection among blood donors in Ile-Ife, Nigeria. For the first time in Nigeria we employed an automated real-time PCR- method to investigate the prevalence of occult HBV in blood donors.MethodsBlood donors screened with HBsAg immunochromatographic rapid test kits at the blood transfusion units of two hospitals and found to be negative were recruited into the study. Questionnaires to elicit risk factors for HBV infection were administered and then 10 ml of blood was collected from each donor. Plasma samples obtained from these HBsAg negative blood donors were screened again for HBsAg using an enzyme-linked immunosorbent assay (ELISA) method, and those found negative were screened for the presence of total antibody to the HBV core antigen (anti-HBc) using ELISA method. Those positive to anti-HBc were then tested for HBV DNA, using an automated real-time PCR method.ResultsFive hundred and seven blood donors found HBsAg negative by immunochromatographic rapid test kits at both blood transfusion units, were tested for HBsAg using ELISA and 5 (1 %) were HBsAg positive. The 502 found negative were tested for anti-HBc and 354 (70.5 %) were found positive implying previous exposure to HBV and 19 (5.4 %) of the 354 anti-HBc positive had HBV DNA signifying occult HBV infection. No risk factors were found to be associated with the presence of HBV DNA among those who tested positive.ConclusionOccult HBV infection exists in blood donors in Ile-Ife, Nigeria and the use of HBsAg alone for screening prospective donors will not eliminate the risk of HBV transmission in blood transfusion or stem cell transplantation.

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Surveillance and proper hygiene have been identified as key components in the fight against HAIs and antimicrobial resistance in hospital setting. This study assesses the pattern of hospital acquired infections (HAIs) and state of hygiene in a tertiary hospital in southwest, Nigeria. Data collected routinely between January 2000 and December 2009 by the infection control committee on HAI and primary data generated on hygiene in the wards were analysed using appropriate statistical techniques. A total of 37,957 patients were admitted during the period under review and 1129 cases (3.0%) of HAI were reported. The highest prevalence of 9.0% was reported in 2006. The Intensive Care Unit (ICU) had the highest period prevalence of 14.7% followed by Orthopaedics ward (7.7%). Surgical ward contributed the highest number of cases with 433. Gram negative organisms were the most implicated (78%) of which Klebsiella species was 38% while Staphylococcus aureus was the only Gram positive organism identified (28%). Hand washing was practised universally by health workers but facilities for proper hand washing were inadequate. The pattern of HAI has not changed significantly in the past 10 years and Klebsiella was the most implicated organism in HAIs and ICU. Facilities for proper hand washing are suboptimal. We recommend the introduction of hand washing policy for the hospital and the provision of an environment conducive for its implementation by the hospital management as well as adequate support for the infection control committee in the discharge of her duties.

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Autopsy lung specimens from 20 children with kwashiorkor and 20 with other miscellaneous diseases, at the Obafemi Awolowo Teaching Hospital complex, Ile-Ife, Nigeria, were analyzed for the presence of aflatoxin using high-performance liquid chromatography. Aflatoxins were detected in 18 children who died from kwashiorkor but only in 13 of those who died from miscellaneous diseases. Of the 10 children, 5 in each group, who died with pneumonia, all had detectable levels of aflatoxins in their lungs. The two children with congestive cardiac failure, one secondary to pneumonia and the other secondary to tuberculous pericarditis, had more than two detectable aflatoxins in their lungs. These findings demonstrate that Nigerian children are exposed to aflatoxins and that high levels can accumulate in lung tissue.