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Ehldas t1_jdoq005 wrote

Reply to comment by masshiker in Why does tetanus vaccination lasts longer than influenza vaccination? by E-C-A

A vaccine is given before an infection (whether viral or bacterial), to stop it happening in the first place.

There are some rare exceptions, like rabies in some cases, where you would use a post-exposure vaccine, but for the vast majority it's a preventive measure not a curative one.

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emelrad12 t1_jdqgo5n wrote

Well rabies is really slow with incubation of months compared to days for others, so technically you are still giving it before the virus is even noticed by the immune system.

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