Blood-borne diseases can be transmitted by which of the following methods?

Blood-borne diseases are primarily transmitted through direct contact with infected blood. When infected blood enters the bloodstream of another person, either through open wounds, the use of contaminated needles, or blood transfusions, the pathogen can spread. This route of transmission is crucial in understanding how diseases like HIV, Hepatitis B, and Hepatitis C proliferate, as they are specifically designed to thrive within the bloodstream.

Other methods, such as contaminated food, insect bites, or airborne particles, do not typically relate to the transmission of blood-borne diseases. Contaminated food may lead to foodborne illnesses, insect bites can transmit vector-borne diseases, and airborne particles usually pertain to diseases spread through respiratory droplets, none of which align with the mechanisms of blood-borne pathogens. Thus, the safest understanding for transmission of blood-borne diseases is indeed through infected blood directly entering the bloodstream.