HIV is highly transmissible through which of the following fluids?

HIV is highly transmissible through blood because it contains a high concentration of the virus. When blood from an infected person comes into contact with mucous membranes, open wounds, or is directly injected, there is a significant risk of transmission. This is why blood is considered a primary mode of transmission for HIV, particularly in scenarios involving sharing needles or transfusion of contaminated blood.

Other fluids like feces, urine, and tears do not contain a sufficient viral load to transmit the virus effectively, which is why they are not considered significant routes of transmission. This knowledge is critical in understanding and implementing preventive measures in healthcare and community settings.