Topics: Immunity and Vaccines Quiz
Which of the following is NOT part of the first line of defense?
A. skin
B. B cells
C. sweat
D. lysozyme
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Which of these scenarios could be a direct cause of a disease becoming a pandemic?
A. sick child attending school
B. sick family returning from a foreign country
C. mosquito in a field next to houses
D. patient sneezing on a doctor