Which of the following is an example of a live virus vaccine?

Measles vaccine is an example of a live virus vaccine because it contains a weakened form of the measles virus, which is capable of stimulating an immune response without causing the disease in healthy individuals. Live virus vaccines work by mimicking a natural infection, helping the body to develop immunity through the production of antibodies.

This type of vaccine is particularly effective as it often provides long-lasting immunity with fewer doses compared to inactivated or subunit vaccines. In contrast, vaccines such as Typhoid, Inactivated Polio, and Hepatitis A are made from killed or inactivated pathogens or components of pathogens, which do not replicate and therefore may require multiple doses to achieve immunity.