65 LR Two Question 9
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Permalink Submitted by TheHague93 on Sep 8 2016
This was really really helpful, but one quick question on this. How do you know that West Nile wasn't carried to North America by a person already infected by a mosquito? My thought was that they may have carried it but not infected other beings (birds, mammals, mosquitoes...).

Permalink Submitted by majorgeneraldave on Sep 8 2016
Well, we are told the virus spread to North America in the third sentence.
Now, you're right that a person could have come to North America while infected with the virus, but she could never have transmitted the virus to anyone (first and last sentences of the passage), thus, she cannot have been responsible for its spread.