Dr. Baruch Blumberg discovered an antigen in 1967 that could detect Hepatitis B in human blood, and within two years had also discovered the Hepatitis B vaccine. The document discusses Hepatitis B and C as the most common and dangerous types, noting they can last a lifetime and occur in all age groups and both sexes. It adds that Hepatitis transmission is not limited to certain times of year, but occurs most often during periods of heavy rainfall.