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Small pox is a contagious disease.
Humans do not get fowl pox. Fowl pox is a disease of birds (fowl). Chickenpox, oddly enough, is a disease of humans, not chickens. Fowl pox and chickenpox are not the same thing.
I am presuming the answer is small pox, and the answer is cow pox.
A disease called small pox. the Spanish conquistadors brought it over from Spain.
Syphilis.
It is a noun (chicken pox is the name of a specific disease).
chicken pox
chicken pox!
Chicken Pox
Small pox
chicken pox and shingles