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Immunity and Vaccines › View

Since we have our immune system to protect us from disease, why do we still need a vaccine?

A. Because some diseases are too severe for our immune system.

B. Because adaptive immunity takes days to weeks to initiate a response and sometimes it is too late.

C. Because some people are immune deficient or have weak immune systems.

D. All of the above

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PHE › View

Swimming can be done in any 9f the following except

A. Rivers

B. Swimming pool

C. Pond

D. Puddles

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