"We have now set up a global response unit, which brings together all people across WHO in headquarters, in the regions, to deal with the formal response" to Zika, said WHO expert Anthony Costello.
The UN health body had said Monday that a surge in cases in South America of microcephaly -- a devastating condition in which a baby is born with an abnormally small head and brain -- was likely caused by the mosquito-borne Zika virus, and declared the situation a "public health emergency of international concern."
Costello, a paediatrician and an expert on microcephaly, told reporters in Geneva that the WHO's new response unit would aim to use "all the lessons we've learned from the Ebola crisis" to help quickly address Zika and the birth defects and neurological conditions it is believed to cause.
He emphasised the urgency of rapid action, stressing there was no reason to believe the crisis would remain limited to South America, where 25 countries so far have reported Zika cases.
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Underlining his point, Thai officials announced Tuesday that a man had contracted the virus in the country.
Cape Verde, which lies off the coast of west Africa, has also already reported domestic Zika cases.
Jitters over the virus have spread far beyond the affected areas to Europe and North America, where dozens of cases have been identified among travellers returning from Latin America.
"Given that there is a vector, and given that we are in a global world, and presumably it crossed the Atlantic at some stage to get into Latin America, there is no reason particularly to think it couldn't travel in the opposite direction," Costello said.