has function has role immunizes against disease immunizes recipient immunizes against pathogen has drug brand name hepatitis A Hepatovirus A Homo sapiens preventive vaccine function prophylactic vaccine Hepatitis A virus vaccine Canada licensed human vaccine Canada licensed vaccine role licensed human hepatitis A virus vaccine Epaxal vaccine Oliver He VIOLIN: https://violinet.org/vaxquery/vaccine_detail.php?c_vaccine_id=570 vaccine 570 Epaxal Allen Xiang Epaxal