How can exposure to HBV occur?

Exposure to Hepatitis B Virus (HBV) primarily occurs through direct contact with infectious bodily fluids, especially blood. This virus is transmitted when these fluids get into the bloodstream of an uninfected person. For instance, this can happen through needle stick injuries, sharing of personal items that may have come into contact with infected blood, or through sexual contact.

Unlike the other options, which do not represent common transmission routes for HBV, direct blood contact is a well-documented and significant method of transmission. Other forms, such as sharing food, drinking contaminated water, or inhaling air, do not facilitate the spread of this virus, as it does not transmit via casual contact or respiratory droplets.