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Agents of Disease › ViewWhy do doctors suggest people get a flu vaccine every year?
A. viruses replicate more rapidly over time.
B. viruses can mutate from year to year.
C. vaccines are absorbed by the body after a year
D. vaccines get stronger over time.
Hematology › View
The erythrocytosis seen in relative polycythemia occurs because of:
A. decreased arterial oxygen saturation
B. decreased plasma volume of circulating blood
C. increased erythropoietin levels
D. increased erythropoiesis in the bone marrow