In endemic West Nile virus cycles, which combination is correct?

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Multiple Choice

In endemic West Nile virus cycles, which combination is correct?

Explanation:
West Nile virus is maintained in nature by an enzootic cycle between birds as reservoir hosts and mosquitoes as vectors. The virus replicates in viremic birds, mosquitoes pick it up when feeding, and then transmit it to other birds, sustaining the cycle. Humans and horses can be infected by mosquito bites, but their viremia is typically too low to infect mosquitoes, so they do not sustain transmission. Therefore, the combination that fits the endemic cycle is birds and mosquitoes. The other pairings involve hosts that are incidental and do not drive ongoing transmission.

West Nile virus is maintained in nature by an enzootic cycle between birds as reservoir hosts and mosquitoes as vectors. The virus replicates in viremic birds, mosquitoes pick it up when feeding, and then transmit it to other birds, sustaining the cycle. Humans and horses can be infected by mosquito bites, but their viremia is typically too low to infect mosquitoes, so they do not sustain transmission. Therefore, the combination that fits the endemic cycle is birds and mosquitoes. The other pairings involve hosts that are incidental and do not drive ongoing transmission.

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