Chemical breakdown is affected by it I just did in zymes treated by the track and accessory organs as well as hydrochloric acid secreted by the stomach the G.I. tract is protected from the corrosive actions of these enzymes and acid by a mucous membrane composed of epithelial cells which secrete mucus and fluid
In a lot of cases, many people are unaware that they have HIV/AIDS, therefore it doesn't get reported and they end up spreading it to those they share beverages with or have sexual interactions with.