Which vaccine provides immunity against rubella?

The MMR vaccine is specifically designed to provide immunity against three viral infections: measles, mumps, and rubella. Rubella, also known as German measles, is a contagious viral infection that can have serious consequences during pregnancy, such as congenital rubella syndrome in the developing fetus. The MMR vaccine is a live attenuated vaccine, meaning it contains weakened forms of the viruses, which stimulate the immune system to develop a protective response without causing the disease itself. This vaccine is typically administered in childhood, and it plays a crucial role in public health by reducing the incidence of these diseases in the population.

In contrast, the other vaccines mentioned serve entirely different purposes: the tetanus vaccine protects against tetanus, the varicella vaccine is used to prevent chickenpox, and the pneumococcal vaccine offers protection against infections caused by Streptococcus pneumoniae. Each of these vaccines targets specific pathogens and does not provide immunity to rubella. Thus, the MMR vaccine is the correct choice for immunity against rubella.