Which of the following materials could be potentially infected with bloodborne pathogens, assuming they are not mixed with human blood?

Semen or vaginal secretions

Sweat

Saliva

Feces

Tears

Semen or vaginal secretions

Explanation:

"Bloodborne pathogens" refer to microorganisms that can be found in the blood or body fluids of humans. There are many kinds of bloodborne diseases such as Hepatitis B and Hepatitis C as well as Human Immunodeficiency Virus (HIV). They can be transmitted to another person through having contact with the infected human blood or body fluids.

Assuming that the materials above are not mixed with human blood (meaning, they are not contaminated with blood), then the semen or vaginal secretions are the only materials where the bloodborne pathogens can be transmitted. Thus, it is important not to have sexual contact with the contaminated person such as people with HIV.

So, this explains the answer.