Any invasive procedure, including dental work and cleaning, can introduce bacteria into your bloodstream.

These tissues are often handled aseptically, meaning care is taken at every stage of handling not to introduce bacteria.

Party pumps utilize outside air, thus introducing oxygen and bacteria into the keg.

However, if the procedure is not done in a sterile fashion, it can introduce bacteria into the bladder.

Some scientists say the vaginal insertion may introduce bacteria along with the drug.

Certain dental or surgical procedures could introduce bacteria into your blood and put you at risk for endocarditis.

Sufficient packaged organisms had also been brought to introduce symbiotic bacteria.

Sexual intercourse may introduce bacteria into the urinary tract, especially in women.

Using a small towel to scrub your face might seem like a harmless practice, but you could be introducing bacteria onto your skin.