Unlike vaccines used against other viruses such as measles, mumps, rubella and varicella, people need to be vaccinated annually against influenza.
(vaccines; used; against other viruses such as measles, mumps, rubella and varicella) (people; need; to be vaccinated annually against influenza) (people; to be vaccinated; T:annually; against influenza)
vaccines people people
used need to be vaccinated
against other viruses such as measles, mumps, rubella and varicella
to be vaccinated annually against influenza
T:annually against influenza