Boosters necessary every 10 yrs. Endemic in very large part of third-world countries. Second vaccination after 6-12 months. Valid 10 years. Can now be combined with Hepatitis B in one injection.
Infection increases risk of cirrhosis with repeated alcohol use.
Recommended for risk groups incl. Combined injection with Hepatitis A. Can be lethal. Oral capsule or injection. Valid 3-4 years.