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Itâs not entirely clear why the length of acquired protection varies with different vaccines. A single dose of some vaccines provides lifelong immunity, while others require an additional dose (boosters) in order to maintain immunity.tâs not entirely clear why the length of acquired protection varies with different vaccines. A single dose of some vaccines provides lifelong immunity, while others require an additional dose (boosters) in order to maintain immunity.
2) If you need any live virus vaccines, get them one to three months before starting biologics. Flu vaccine injections are dead viruses and can be given anytime. But any live virus vaccine needs to be given one to three months before starting immunosuppressant drugs.