Discussion
Which of the following components of the vertebrate immune response occurs first upon invasion by a virus or bacterium?
Answer: C
Correct answer: The inflammatory response
Inflammation is immediate - damaged tissue and resident macrophages release mediators within minutes, dilating vessels and drawing in phagocytes. Complement follows quickly, but the lymphocyte responses take days, because the few cells that recognise the antigen must first be found and made to divide.
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