Milk and milk products are designated as potentially hazardous foods.

This is true, because people are lactose intolerant

This is true because people can be lactose intolerant 

What happens to the influenza virus every 20-40 years and why?

Hiv can be transmitted through oral sex. you can get hiv through vaginal fluid and semen. if you have an open sore or cut in or near your mouth and an you get the semen or vaginal fluid of an infected person in those cuts or sores, you can get hiv