Hepatitis C
Hepatitis C, or HCV, causes a rapidly developing and often long-lasting disease. Spread mainly by contact with infected blood, HCV is the major cause of "transfusion hepatitis," which can develop in patients who are given blood, although, donated blood is regularly tested for hepatitis C as of the early 2000s. The existence of a third hepatitis virus (in addition to the A and B viruses) became clear in 1974, although HCV was first identified in 1989.
Hepatitis C is generally mild in its early, acute stage, but it is much more likely to produce chronic liver disease than hepatitis B. About two of every three persons who are infected by HCV may continue to have the virus in their blood and become carriers who can transmit the infection to others.
The most common way of transmitting hepatitis C is when blood containing the virus enters another person's bloodstream through a break in the skin or the mucosa (inner lining) of the mouth or genitals. HCV may be passed from an infected mother to the infant she is carrying (however, the risk of infection from breast milk is very low). It also can be spread through sexual intercourse, especially if one partner is acutely infected at the time.
