Most of the cases were identified in the southern Mexican states of Chiapas and Oaxaca

"We are dealing with a tricky virus, full of uncertainties, so we should be prepared for surprises," World Health Organization...

The virus has reportedly spread to 44 countries and territories, including China and Thailand

Health officials confirmed 9,000 kilograms of the larvicide in question have been imported

  Brazil is investigating more than 4,300 suspected cases of microcephaly.

The World Health Organization estimates Zika could eventually affect as many as 4 million people worldwide

The mosquito-borne Zika virus has been linked to brain damage in thousands of babies in Brazil.