What diseases can be transferred through saliva?Examples of diseases spread through blood or other body fluids:hepatitis B - blood, saliva, semen and vaginal fluids.hepatitis C - blood.human immunodeficiency virus (HIV) infection - blood, semen and vaginal fluids, breastmilk.cytomegalovirus (CMV) infection - saliva, breastmilk, semen and vaginal fluids, urine.