Biology, 08.10.2019 00:10 juansantos7b

Some viral diseases are dangerous only when a person is infected for the first time; subsequent infections produce only mild symptoms or go entirely unnoticed. this pattern can be explained by the action of

a. memory cells that trigger a secondary immune response
b. specific antibodies that remain concentrated in the bloodstream for life after the first infection event
c. memory cells that trigger a primary immune response
d. t cells that trigger a primary immune response

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Some viral diseases are dangerous only when a person is infected for the first time; subsequent inf...