Victoria Micieli, director and scientist at the Center for Parasitological and Vector Studies of the national scientific research institute CONICET, classifies different species of mosquitoes at a laboratory in La Plata, in Argentina's Buenos Aires Province, on Tuesday. (Luis Robayo/AFP via Getty Images)
Puerto Rico has issued a public health emergency after recording an unusually rapid rise in dengue cases over the first few months of this year.
It's the latest area to grapple with a surge of infections of the mosquito-borne disease, which sickens an estimated 100–400 million people globally each year.
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