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by cbhl 2902 days ago
Because they used to not exist in these areas. That's what the word "invasive species" means.
1 comments

Indeed. Aedes aegipti originated in Africa and spread to throughout the world due to trade and globalization (including the transatlantic slave trade). It brought with it many African mosquito-bourne diseases such as Dengue and Yellow Fever, which are specifically transmitted by Aedes mosquitoes.