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In page Yellow fever:
"The main vector (A. aegypti) also occurs in tropical and subtropical regions of Asia, the Pacific, and Australia, but yellow fever had never occurred there until jet travel introduced 11 cases from the 2016 Angola and DR Congo yellow fever outbreak in Africa. Proposed explanations include:[1]
- That the strains of the mosquito in the east are less able to transmit yellow fever virus.[citation needed]
- That immunity is present in the populations because of other diseases caused by related viruses (for example, dengue).[2]
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