Active pathogen, Very small amount, Person gets ill, Acquires active immunity, Dead or altered pathogen = vaccine, Very large amount, Person does not get ill, Antibody enters fetus via placenta or breast milk, Baby does not get ill - obtains immediate, short-term protection, Baby does not acquire immunity – will get ill on subsequent exposure, Serum, Person does not get ill - obtains immediate, short-term protection, Person does not acquire immunity – will get ill on subsequent exposure.

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