Hepatitis A occurs in waves and during larger outbreaks can affect hundreds of people in a short period. It is a liver infection most commonly transmitted through dirty hands, contaminated water, or food. Although it usually has a mild course, it can be dangerous for older or immunocompromised individuals. However, hepatitis is not only about type A – there are several forms of viral hepatitis that differ in severity and mode of transmission. Fortunately, effective protection exists against the most common types, A and B: vaccination.