Hepatitis A is spread through fecal-oral routes. Basically contaminated foods and drinking water. Incubation period averages around 28 days, with a range of 15-50days.
Hepatitis B & C are spread in similar manner as HIV, principally sexually and via contaminated blood and blood products. HBV has an average incubation period of 4 months (ranging 1.5-6 months). During this period, sufferers display no or mild symptoms. HCV has an incubation period of 0.5-6 months; current antibody tests for the same show a positive result at about 2-3 months after exposure.
Currently, HAV & HBV vaccines are available, with the latter being given in three doses and the former in two doses 6-12 months apart. HCV vaccine not yet in the market.