IT-E131 from B&K Precision at Allied Electronics & Automation. This is the RS232 to TTL interface kit includes both the RS232 to TTL adapter and a RS232 DB9 to DB9 cable. Hepatitis B is a serious disease caused by a virus that attacks the liver. The virus, which is called hepatitis B virus (HBV), can cause lifelong infection, cirrhosis (scarring) of the liver, liver cancer, liver failure, and death. Hepatitis B vaccine is available for all age groups to prevent HBV infection.