(CNN) A Hawaii newborn born with microcephaly, an unusually small head, had been infected with the Zika virus. The case could be the first one reported in the United States linking the birth defect with the virus. The Centers for Disease Control and Prevention confirmed that the baby recently born in Oahu was infected in the past. "The mother likely had Zika infection when she was residing in Brazil in May 2015 and her newborn acquired the infection in the womb," Hawaii's health department said. "Neither the baby nor the mother are infectious, and there was never a risk of transmission in Hawaii."CDC: Baby born in Oahu was infected in the pastThe mother likely got Zika infection while living in Brazil
But in the past four months, microcephaly cases in _ rocketed to 3,500, and 46 babies died.