noun
a mild form of smallpox virus used in the past for vaccination against smallpox
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Cowpox is a viral disease that affects cows and can be transmitted to humans.
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I heard that cowpox can be passed from cows to humans, but it's not very common.
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Did you know that cowpox is like a weird cow version of chickenpox?
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Her patience was like cowpox, slowly building immunity to frustration over time.