Aedes aegypti mosquitoes are displayed at an exhibition on Jan. 28 in Brazil. The mosquitoes can be carriers of the Zika virus. Several cases of the virus have spread to Puerto Rico. Mario Tama/Getty Images hide caption

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Zika Virus

Puerto Rico Health Official 'Very Concerned' About Zika's Spread

An epidemiologist says the island has been lucky so far, but needs to stop the virus at its source — where mosquitoes breed.

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