The two most common forms are called Hepatitis A and B. Hepatitis A is spread through food and water contamination. Once again, undercooked or raw shellfish and seafood along with raw vegetables are the likely sources. Symptoms develop about one month after exposure to the virus. Hepatitis B is more serious than Hepatitis A, resulting in chronic liver disease. It is spread through blood transfer rather than by eating. This can happen during medical surgical or dental procedures, during immunization with improperly sterilized syringes, while being tattooed or having a shave, or through sexual contact.