Which one of the following statements is not correct?
a. Hepatitis B virus is transmitted much like HIV.
b. Hepatitis B, unlike Hepatitis C, does not have a vaccine.
c. Globally, the number of people infected with Hepatitis B and C viruses are several times more than those infected with HIV.
d. Some of those infected with Hepatitis B and C viruses do not show the symptoms for many years.