To vaccinate someone is to give them a vaccine so their body learns to fight a disease before they ever meet it. Doctors and nurses vaccinate people; farmers and vets vaccinate animals. The grammar is worth learning as a set. You vaccinate someone against a disease — "vaccinate children against measles". Very often it is passive, because the person receiving it is the one being talked about: "I was vaccinated as a baby", "have you been vaccinated?" The noun is vaccination, and the adjective people now use is vaccinated: "fully vaccinated". Speakers of everyday English often say get a shot (American) or get a jab (British) instead — those are the words in the kitchen; vaccinate is the word in the clinic and the newspaper. Two neighbours to sort out. Immunise means almost the same thing and is used in much the same way, and inoculate is an older, more formal word for it. Vaccinate is the most common of the three. Also, vaccinate is not the same as cure. It does nothing for someone who already has the disease; it is protection given in advance, which is why it is done to healthy people.