An exposure that might place a worker at risk for HBV, HCV, or HIV infection is defined as:
Indirect exposure from contaminated objects is a risk, because hepatitis B virus can remain infectious on environmental surfaces for up to a week (7 days) in the form of dried blood.
This means you must always treat blood, wet or dry, as infectious!
A vaccination to prevent hepatitis B virus infection is available. The hepatitis B vaccine series is a sequence of three shots that stimulate a person’s natural immune system to protect against the virus. After the vaccine is given, the body makes antibodies to protect a person against the virus. Antibodies are specialized proteins found in the blood that produce an immune response to a virus invading the body. These antibodies are stored in the body to guard against future infections. They will fight off an infection if a person is exposed to the hepatitis B virus in the future.