Rare cases of mosquito- and tick-borne diseases, including Powassan and dengue, crop up across the U.S.

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As the end of summer approaches, cases of rare insect-borne diseases are cropping up weekly across the country, including eastern equine encephalitis, dengue fever and West Nile virus — all spread by mosquitoes — and the tick-borne Powassan virus.

This week, Alabama reported two cases of eastern equine encephalitis, or EEE, including one death. The rare disease has a 30% fatality rate, and many survivors have lasting neurological issues. In Connecticut, meanwhile, four residents tested positive for Powassan virus, the first infections in the state this year.

The U.S. also recorded its first cases of locally transmitted malaria in two decades this summer: seven in Florida and one each in Maryland and Texas.