Saliva, tears, sweat, vomit, urine, nasal secretions and pus. That would increase the risk for everyone. Most blood-service organizations began testing donated blood in the spring of 1985. Red cells and platelets cannot be treated but they are tested. Disposable needles and equipment are used for each donor.
Nothing is shared or reused.
It has always been safe to donate. It is carried in fluids and tissues that contain blood cells. It can't be transmitted in the air or water or passed by touching dry skin. Since HIV is spread primarily by having unprotected sex or by sharing needles with infected partners, people are safe from HIV infection in everyday school and work activities. HIV is either not in saliva or is found in such low concentrations that it is not transmissible.