Hepatitis A: a serological study in the Canadian Armed Forces

Area of Science:

• Immunology
• Epidemiology
• Public Health

Background:

• Hepatitis A virus (HAV) poses a risk to military personnel, particularly those deployed internationally.
• Understanding the seroprevalence and incidence of HAV is crucial for effective public health interventions within the Canadian Forces.

Purpose of the Study:

• To determine the prevalence and incidence of anti-hepatitis A antibodies among Canadian Forces personnel.
• To investigate the relationship between age and hepatitis A antibody prevalence in this population.

Main Methods:

• Sera from 3958 Canadian Forces personnel were analyzed for anti-hepatitis A antibodies using competitive radioimmunoassay.
• Seroconversion in paired sera was used to measure the incidence of viral hepatitis A.

Main Results:

• The overall prevalence of anti-hepatitis A antibodies was 23.5%.
• The incidence of viral hepatitis A was 0.17%.
• A direct correlation was observed between increasing age and higher anti-hepatitis A antibody prevalence.

Conclusions:

• A significant proportion of Canadian Forces personnel exhibit prior exposure to Hepatitis A.
• Age is a key factor influencing hepatitis A seroprevalence in this cohort.
• Findings support the need for age-specific hepatitis A surveillance and vaccination strategies within the Canadian Forces.