Rio de Janeiro - The US Centers for Disease Control says researchers have found the strongest evidence so far of a possible link between a mosquito-borne virus and a surge of birth defects in Brazil.
The CDC said on Wednesday that researchers found the dengue-like Zika virus in the babies of two women who miscarried and two newborns who died. Those who were born had small heads, a rare condition known as microcephaly.
CDC's director of mosquito-borne diseases is Dr Lyle Petersen and he says that finding the virus in brain tissue is "very significant."
Brazil's government says 3 530 babies have been born with microcephaly in the country since October. The number was less than 150 in 2014.