Which of the following diseases is NOT transmitted through blood?

Hepatitis A is the correct answer as it is primarily transmitted through the fecal-oral route rather than through blood. This means that it spreads through ingestion of food or water that has been contaminated with the feces of an infected person. In contrast, Hepatitis B, HIV, and syphilis are all diseases that can be transmitted through contact with infected blood. Hepatitis B is spread through blood or bodily fluids, HIV is transmitted through blood, sexual contact, and from mother to child during childbirth, and syphilis can be spread through direct contact with syphilitic sores, which may occur in blood. Understanding these transmission methods is crucial for implementing proper health safety measures and prevention strategies.