does the amount of virus you’re exposed to affect the risk of getting sick?

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That is, am I as likely to get sick from a small amount of virus as am I from a big amount?

In: Biology

Depends on the pathogen. Salmonella (a bacteria, though) requires 2-3 million active bacteria to infect you. Norovirus, the nasty little fucker, only requires 10-20 individual virus particles to make you wish for death.