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The Zika virus is a mosquito-borne illness predominately in Central and South America, but outbreaks have occurred in Africa, Southeast Asia, the Pacific Islands and the Americas, according to the Centers for Disease Control and Prevention.

The last patient tested negative for the Ebola virus in Liberia, making all three West African countries hardest hit by the outbreak to be free of the disease, the World Health Organization announced Thursday. Though the agency warned that more…