Discussion
A virus that infects only one species is described as having
Answer: D
Correct answer: a narrow host range
Host range is set chiefly by whether a cell carries a receptor the virus can bind, and secondarily by whether it can support the later stages of the cycle. A virus restricted to one species has a narrow range - and the narrowness matters for eradication, since a pathogen with no animal reservoir, as smallpox had none, can in principle be eliminated entirely.
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