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 birds 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.
Type- inference
1. Mosquitoes, in turn, become infected with the virus when they bite certain infected birds or mammals
2. Humans sometimes catch West Nile virus, but the virus never becomes abundant enough in human blood to infect a mosquito.
(A) West Nile virus will never be a common disease among humans.- incorrect, will never is too strong, we know that humans do not transmit
(B) West Nile virus is most common in those parts of North America with the highest density of mosquitoes.- incorrect, do we know whether birds and mammals are present in that part?
(C) Some people who become infected with West Nile virus never show symptoms of illness.- incorrect, the visibility of symptoms is not discussed
(D) West Nile virus infects more people in northern Africa than it does in North America.- incorrect, we are not given any information to make a comparison
(E) West Nile virus was not carried to North America via an infected person.- Correct- on combining 1 and 2.
Answer E
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67% (01:42) correct 
