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[–]hennaojichan 4 insightful - 2 fun4 insightful - 1 fun5 insightful - 2 fun -  (1 child)

Because it's not a vaccine?

[–]weavilsatemyface 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (0 children)

Of course its a vaccine. No vaccine in the world, ever, in the history of mankind, has had a 100% protective effect. Most vaccines are considered to be doing pretty well to have a 90% effectiveness, and even then, there are people for whom it never takes.

Due to a medical condition I have, I am considered at high risk of Hepatitis B. (One of my medications can reactivate the Hep B virus if it is in my system.) So in the last three years, I've been vaccinated against Hep B twice, and in both cases, the vaccine's protective effect has lasted less than a year. It normally lasts for a minimum of ten years.

Vaccines aren't magic.