High Burden of Hepatitis B Virus and Occult Infection Among HIV-Positive Adults and Pregnant Women in Southwest Cameroon.

Chronic hepatitis B virus (HBV) and Occult HBV infection (OBI) remain a health burden in sub-Saharan Africa. This study investigated HBV prevalence, circulating genotypes, and associated risk factors with HBV exposure among HIV-positive adults on antiretroviral therapy and pregnant women in southwestern Cameroon. A total of 233 HIV patients and 190 third-trimester pregnant women were screened for HBV DNA, viral load, serological markers (HBsAg, anti-HBc, and anti-HBs), and HBV genotypes were determined by partial sequencing of the S gene. HBV DNA was detected in 10% of HIV-positive patients and 4% of pregnant women, with an overall prevalence of 7%. OBI accounted for 9% and 3%, respectively. Anti-HBc seroprevalence was high (75% in HIV, 46% in pregnant women), while self-reported vaccination coverage was low (1% and 11%). Genotypes A, B, D, and E were identified, with genotype B reported for the first time in Cameroon. Immune escape mutations and the adefovir resistance mutation rtA181V were detected. Self-reported alcohol use was associated with HBV exposure in HIV patients (aOR = 2.08; p = 0.028) and inversely associated with tertiary education in pregnant women (aOR = 0.18; p = 0.038). This study highlights a significant burden of HBV and OBI among vulnerable populations in Cameroon.