Fair dinkum thinkum
- Mar 7, 2007
- Basic Beliefs
- Strong Atheist
Yes, of course it is.
A vaccine is a treatment that primes the immune system to respond to a pathogen that it may encounter in the future, so that any such future encounter has a reduced probability of causing severe symptoms.
Nothing in that definition says anything whatsoever about how frequently a vaccine needs to be administered, or how long it might remain effective.
As you evidently don't know what a vaccine even is, you really don't have any chance of offering a useful opinion on the subject, and would be better reading the contributions of the competent, rather than attempting to contribute yourself. But I am sure that your demonstrated inability to say anything helpful won't stop you from doing whatever the fuck it is you are doing instead.