In the old days, milkmaids were exposed to cowpox from milking the cows, and this fortuitously gave them some protection from smallpox.What was happening in the milkmaids?
A) They were receiving a dose of generic IgG from the sick cows.
B) They were effectively receiving a vaccination from a related virus.
C) They were heightening their overall immune response due to exposure to the cowpox and other cow parasites.
D) They had a stronger immune response from drinking the milk, which sent cow B cells circulating through their blood.
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