What is hematocrit and how is it determined? What is normal hematocrit and what will happen if it’s too low or high? In an individual with an intact immune system who is immunocompetent, repeat infections by the same pathogen lead to: O increased memory B cells but decreased memory T cells T decreased somatic hypermutation and isotype switching O more IgM and more IgG, both with higher affinity more IgG with higher affinity and low to no IgM

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