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Birds and mammals can be infected with West Nile virus only through mosquito bites.
Mosquitoes, in turn, become infected with the virus when they bite certain infected bird or mammals.
The virus was originally detected in northern Africa and spread to North America in the 1990s.
Humans sometimes catch West Nile virus, but the virus never becomes abundant enough in human blood to infect a mosquito.
The statements above, if true, most strongly support which one of the following?
West Nile virus will never
The statements provide no basis to believe that humans are safe from West Nile becoming a common disease.
6% picked this
West Nile virus is most
The statements do not indicate where West Nile is most common.
10% picked this
Some people who become infected
The virus will never become abundant enough in a human to infect a mosquito, but that does not mean that some people never show symptoms of illness.
4% picked this
West Nile virus infects more
The statements do not indicate how common West Nile virus is in northern Africa nor how common it is in North America.
2% picked this
West Nile virus was not
Why this is right
Since birds, mammals, and mosquitoes cannot be infected with West Nile virus by exposure from humans, the virus must have been brought to North America by a bird, a mosquito, or a mammal other than a human.
Skill tested: Most Supported · how this choice captures the argument's function is the move to repeat next time.
78% picked this
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