Select your answer:
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Vaccines › ViewWhy do we need a new vaccine for Influenza every year?
A. because the virus mutates very quickly
B. because the virus is unknown
C. because the vaccine works for a short time
D. none of the answers
Immunology › View
CD4 cells are also called as
A. NK cells
B. Suppressor T cells
C. Cytotoxic T cells
D. T helper cells