Hepatitis A: It rarely is life threatening, the person gets infected by consuming water or food contaminated with human waste

Hepatitis B: This Hep virus gets transmitted from mother to child, and also through contact with contaminated blood. This hepatitis is also known as serum hepatitis.

Hepatitis C: it is the most common form of Hepatitis and is transmitted by the contact with blood of an infected person. This is a serious illness that can drive to cirrhosis and liver cancer.

Hepatitis D: This is a less common form of the virus, and usually affects drug users already infected with the Hep B virus. This form of Hepatitis is serous due to the fact that complicates the health situation of the people that are already suffering with the Hep B.

Hepatitis E: This form of the virus is very common in places with poor sanitation. It rarely is life threatening.

Currently there are available vaccines for Hepatitis A and B. The other types of Hepatitis do not have a vaccine.

Source: https://www.nlm.nih.gov/medlineplus/magazine/issues/spring09/articles/spring09pg22-23.html