RSV is a virus that is a common cause of upper and lower respiratory tract infection. Repeated infections are common throughout life because natural infection does not confer long-lasting immunity.

Herpes zoster, commonly known as shingles, is a reactivation of the varicella-zoster virus (VZV) in a person who has previously had varicella (chickenpox). Anyone who has had chickenpox can develop shingles because the virus remains in the nerve cells of the body after an attack of chickenpox.

Whooping cough (pertussis) is a serious, contagious, respiratory infection caused by the bacterium Bordetella pertussis.

Meningococcal disease is any infection caused by meningococcal bacteria (Neisseria meningitidis). It is uncommon but very serious.

Measles is a contagious viral illness that causes a skin rash and fever. Serious and sometimes fatal complications include pneumonia and encephalitis (brain inflammation). Measles is also known as rubeola, not to be confused with rubella (German measles).

Influenza, commonly known as the flu is caused by a highly contagious virus that is spread by contact with fluids from coughs and sneezes.