Occupational risk of hepatitis B for police and customs personnel.

A cross-sectional study was undertaken in 1987 to establish whether New Zealand police and customs officers are at excess risk of hepatitis B virus infection as a consequence of occupational exposure to human blood and penetrating injury. The study population comprised all full-time police (n = 5,193) and customs officers (n = 1,026) excluding only a small number on special duty who had already been immunized. The control group comprised the civilians employed by both organizations (n = 964). The prevalence of hepatitis B markers in the control group, when standardized for age, sex, and ethnic distribution, was 13.4%, which agrees well with New Zealand blood donor figures. The prevalence ratios for police officers and customs officers compared with the civilians (adjusted for age, sex, and ethnic distributions) were 0.82 (95% confidence interval (CI) 0.63-1.06) and 0.49 (95% CI 0.34-0.70), respectively. Multivariate analysis was used to further explore the differences in marker prevalence among the three groups, but failed to demonstrate any significant association between occupational variables and marker prevalence. There was an association between time spent living in high-risk areas of the country and marker prevalence. The authors conclude that the question as to whether police personnel should be immunized begs the wider issue of whether or not the whole New Zealand population should be so protected.