Which disease may be transmitted through blood that enters another person's bloodstream?

HIV/AIDS is a disease that is primarily transmitted through the exchange of bodily fluids, particularly blood. When blood from an infected person enters another person's bloodstream, it can lead to the transmission of the Human Immunodeficiency Virus (HIV), which can result in Acquired Immunodeficiency Syndrome (AIDS) if not controlled. The pathways for this transmission include sharing needles, blood transfusions with infected blood, and other practices that involve direct contact with contaminated blood.

In contrast, Hepatitis A is mainly transmitted through the fecal-oral route, not through blood. Influenza is a viral infection that spreads through respiratory droplets when an infected person coughs or sneezes. Tuberculosis, while it can be spread through the air when an infected person coughs, does not typically involve blood transmission as its primary method of spread. Thus, HIV/AIDS is distinctly associated with bloodborne transmission, making it the correct answer to the question regarding diseases that may be transmitted through blood entering another person’s bloodstream.