Although you are (as I understand) right, the question itself is valid, lots of diseases spread to species other than the one that is in the name… Chickenpox, monkeypox, swine flu, or even the Spanish flu.

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russdill 4 days ago | parent [-]

Lots of diseases are potentially zoonotic. When diseases have animals in the name, it often just refers to zoonosis itself (except of course chickenpox). But when diseases or parasites have human in there name, it's almost always because it's a disease that only effects humans.

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thaumasiotes 4 days ago | parent [-]

Note that there was a human flea, but it's extinct. The fleas you might actually find on a human are dog fleas.

	▲	russdill 4 days ago \| parent [-]
		The human flea is not extinct and is actually one of the counter examples as it does infect other species such as pigs. Humans cannot host infestations of dog fleas. You can be bitten by a dog flea, but you cannot complete it's life cycle. If you find yourself constantly dealing with fleas, you are in the presence of an active infestation from another animal.