title: Spread of infection via blood.
mesh_terms: D000163:Acquired Immunodeficiency Syndrome / Q000635:transmission; D001769:Blood / Q000382:microbiology*; D003428:Cross Infection / Q000517:prevention & control*; D006509:Hepatitis B / Q000635:transmission; D006801:Humans; D007239:Infections / Q000635:transmission*