Which of the following exposure routes may result in transmission of bloodborne pathogens?

The correct choice indicates that bloodborne pathogens can be transmitted through skin or facial mucous membranes. This is important because exposure to blood or other potentially infectious materials (like body fluids) can occur if these areas come into contact with contaminated substances. Skin, especially if it is broken (like cuts or abrasions), can serve as a pathway for pathogens to enter the bloodstream. Facial mucous membranes, such as those in the eyes, nose, and mouth, can also absorb these pathogens, posing a risk for infection.

In contrast, intact skin serves as an effective barrier against pathogen entry, meaning the risk of transmission through it is very low. Injection is indeed a known route for transmission of bloodborne pathogens, but it is not the only one; therefore, suggesting "only through injection" overlooks other significant routes such as direct exposure to mucous membranes. Airborne transmission through respiratory droplets is primarily associated with respiratory pathogens and is not a valid route for bloodborne pathogens, which are typically transmitted through direct contact with infected blood or bodily fluids.