because of how the virus generally achieves transmission (blood-to-blood or sexually) and how it doesn’t (through the gastrointestinal tract), quite possibly none of those people received an infectious dose of virus, unless by contact of raw meat with an open cut on the hand or a sore in the mouth. A person might swallow plenty of HIV-1 particles but, if those virions are greeted by stomach acids and not blood, they would likely fail to establish themselves and replicate.
