More than 4,000 cases of microcephaly in Brazilian newborn babies have been linked to Zika virus, an infection transmitted by mosquitoes. Zika virus was first detected in Brazil in May 2015, according to the Centers for Disease Control. The CDC says that the birth defect microcephaly, a potentially crippling condition where a baby is born with a smaller head than expected when compared to babies of the same age and sex, has been connected to Zika virus. "Knowledge of the link between Zika and these outcomes is evolving," the CDC says. Microcephaly could cause a child to simply have a smaller head, or could stunt brain size and development. There is the potential for millions of cases of Zika virus in the Americas next year, health officials say. The World Health Organization is meeting to decide whether the virus outbreak is a public health emergency. Read more about where the Zika virus has been found and where it could spread here. Click through this gallery to see photos of babies in Brazil born with microcephaly and other birth defects after their mothers were infected by Zika. In this photo, a doctor measures the head of a baby born in Recife, Brazil. (Getty)
The Zika Virus is believed to have caused thousands of children in Brazil and elsewhere in the Americas to be born with birth defects, including microcephaly.