Which of the following diseases can be prevented by a live vaccine?

• A. Cholera
• B. Hepatitis B
• C. Type 1 Diabetes
• D. Heart Disease

Answer: (A)

A live vaccine is one that uses a weakened version of the virus or bacteria that causes a disease, enabling the body to mount an immune response without causing the disease itself. Cholera, caused by the bacterium Vibrio cholerae, can indeed be prevented by a live vaccine. This type of vaccine stimulates a robust and long-lasting immune response, offering protection against the severe dehydration and complications associated with cholera.

In contrast, the other options involve either inactivated vaccines (like Hepatitis B, which uses a non-infectious component of the virus to elicit an immune response) or are not preventable through vaccination at all (as in the case of Type 1 Diabetes and Heart Disease, which are not caused by infectious agents). Therefore, the correct answer highlights the unique characteristic of live vaccines in preventing diseases like cholera.