The Zika virus outbreak and related clusters of microcephaly are no longer a public health emergency of international concern, the World Health Organization said Friday.<br />The decision comes nine months after the UN agency first declared an emergency over Zika and its associated complications.<br />Officials stressed, however, that the virus remains a threat wherever it can still be transmitted by mosquitoes and that health officials must not let down their guard.<br />Nearly 30 countries have reported birth defects linked to the virus.<br />WHO, which designated the health emergency in February, says more than 2,100 cases of nervous-system malformations have been reported in Brazil alone.
