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Last time I went in for one, they checked my history and found I'd had four in total, and said that the current recommedations are that once you've had three booster shots you're immune for life.

Like almost anything else in this realm, recommendations are based on studies (say of antibody levels in populations) where the results are distributed on a curve. There is no exactly right answer. It is a matter of risk estimation.

Lessee what Canada's NACI says here.

They still recommend q 10 years.

That doesn't mean there isn't a case to be made for what you were told. If I lived in a penthouse in NYC and all of my manicurist's tools were autoclaved, I wouldn't be very concerned. but if I tended to work with sharp tools, or in dirt, or if I might have cause like Lectric to wade through the flood waters of Louisiana, I would be on a booster shot like a cheap suit. No surprise they are dispensing to those folks.

I did remember one way to die that is arguably worse than tetanus. Boosters are cheap.
_________________________
Jim


'Tis the exceptional fellow who lies awake at night thinking of his successes.