Distribution of both HBsAg and HBsAb negative adults in Mianyang, Sichuan province / 中华流行病学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To understand the distribution of both HBsAg and HBsAb negative adults in Mianyang, Sichuan province, and provide evidences for the development of adult immunization policy.</p><p><b>METHODS</b>From June 2013 to April 2014, a total of 200 929 people aged ≥15 years were selected in Mianyang through stratified cluster random sampling to conduct an interview with standard questionnaire. The blood samples were collected from them for the detection of HBsAg and HBsAb with enzyme-linked immunosorbent assay (ELISA).</p><p><b>RESULTS</b>Among the people surveyed, 13 903 were HBsAg positive (7.0%), 93 763 were HBsAb positive (46.6%), and 93 122 were both HBsAg and HBsAb negative (46.3%). The negative rate of both HBsAg and HBsAb in females (47.1%) was higher than that in males (45.4%). The negative rate of both HBsAg and HBsAb increased with age. The negative rate of both HBsAg and HBsAb was highest in people aged ≥65 years (50.3%) and lowest in people aged 15-24 years (42.9%). The negative rate of both HBsAg and HBsAb was highest in farmers (51.1%) and lowest in medical workers (24.1%). The negative rate of both HBsAg and HBsAb was highest in the widowed (51.1%) and lowest in the unmarried (41.6%). The negative rate of both HBsAg and HBsAb was lower in people with family history of hepatitis B (36.5%) than in people without family history of hepatitis B (46.6%). The negative rate of both HBsAg and HBsAb in Han ethnic group was lower (46.3%) than that in Qiang ethnic group (53.1%), but higher than that in other ethnic groups (43.9%). The negative rate of both HBsAg and HBsAb was higher in rural area (48.9%) than in urban area (43.0%). The negative rate of both HBsAg and HBsAb was lower in people who had received hepatitis B immunization (43.7%) than in people who had received no hepatitis B immunization (47.3%). The differences were all statistical significant (P<0.01).</p><p><b>CONCLUSION</b>The negative rate of both HBsAg and HBsAb was 46.3% in people aged ≥15 years in Mianyang. General population are susceptible to hepatitis B virus infection. It is necessary to develop and implement appropriate hepatitis B immunization strategy for local adult population.</p>