How can we be so certain that diseases-carrying mosquitoes are bound to certain places and won’t cause a mass epidemic? How about people that come and go from countries stricken by malaria, dengue fever, etc.? Don’t they risk becoming infected and bringing the disease overseas worth them?
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Most diseases can’t be spread by mosquitos. Of the diseases that can be spread, almost all of them are dependent on the precise species of mosquito. So for instance Malaria can only be spread by Anopheles mosquitos. So to get a mosquito borne disease, you need to be in an area where both the disease and the right kind of mosquito are together.
So if someone with the disease goes to a new place, it is very unlikely that they get bitten by the right kind of mosquito to pass it on to someone else.
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