One of the world's most complex mosquito-borne viral diseases is making a more significant impact in the U.S. this year. Annually, Dengue is transmitted to about 100 million humans through the bite of infected mosquitoes.
Before 1970, only nine countries had experienced severe dengue epidemics, says the World Health Organization.
Since then, Dengue has become endemic in Puerto Rico, American Samoa, the U.S. Virgin Islands, the Federated States of Micronesia, the Republic of Marshall Islands, and the Republic of Palau.
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