4. Infectious diseases are caused by microscopic living things called High blood pressure O inherited disease
O pathogens
O genes

Pathogens
a pathogen is anything that can cause a disease in a cell. NOT genes. genes are the biological code that makes up a person. genes don’t produce diseases

You did not show us the image of the burger, but i shall try to answer as best i can.  when purchasing food, always consider the ingredients as well as the person who prepared it. consider if they were hygienic people or not, in case the burger was infected with bacteria. no mortal should place an infected burger into their mouth.   

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