HIV/AIDS in Ilorin: changing trend, emerging risk factors. 
We examined HIV seropositivity rates among blood donors, subjects screened for certificate purposes, and four sentinel surveys.  Demographic and clinical features were analysed over periods to determine changes in risk factors and groups at risks.  Questionnaires and protocols were completed for patients screening or clinically assessed, while HIV positivity was determined on the basis of reactivity with two different ELIZA techniques.  The positivity rates were below 2% in blood donors, maximum of 4.3% for sentinel surveys, and 11% among subjects screened for certificate purposes.  Results showed decreasing male:female ratio, younger female patients, and preponderance of traders and artisans.  Weight loss, fever, and diarrhoea were the commonest presenting features.  41% live away from their spouses.  The 11% positivity rate among subjects requiring certificates raises questions on the reliability of sentinel survey figures.  Campaigns should be targeted at artisans, traders and those living away from their spouses.