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The mosquito-borne virus known as chikungunya has sickened nearly 500,000 people in the Dominican Republic, including 109 newborn babies, an official with the Caribbean country’s health ministry said Friday.

The virus was transmitted to the newborns by their mothers, who had the illness when they gave birth, said Carmen Adames, who is coordinating the Health Ministry’s response to the outbreak. None of the infants died, she said.

The Dominican Republic has been particularly hard hit by chikungunya since the first locally transmitted case was documented in the Western Hemisphere in late 2013. The first cases in the Dominican Republic appeared in March.

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