The symptoms of initial infection with human immunodeficiency virus (fever, rash, muscle/joint pains, sore throat, swollen glands, diarrhea) Bloodborne Diseases. Infectious diseases that are spread through contact with infected blood and other body fluids. Bloodborne Pathogens Disease-producing microorganisms that are spread by contact with blood or other body fluids from an infected person. Carrier State A stage of an infectious disease in which the host carries the infectious agent usually in the absence of symptoms.