Pregnant women living in areas of Thailand prone to Zika outbreaks are to be tested for the virus, the Thai Health Ministry said on Monday.
Thailand confirmed on Friday that the Zika virus had caused two cases of microcephaly, a condition that results in babies being born with small heads, the first time it has been linked to Zika in Southeast Asia.
Health and city officials in Thailand downplayed risks from rising infections from the mosquito-borne Zika virus, and expressed concern that disclosing information would damage its tourism industry.
The number of cases of the mosquito-borne Zika virus in Singapore reached 258 on Monday, with health authorities warning it is no longer contained in one part of the city-state and likely to spread further.
Singapore on Monday confirmed more Zika infections, bringing the total number of cases past 50 as mosquito-fighting teams saturated the scene of the outbreak amid growing public alarm.
Spanish health authorities say they have detected the country's first known case of the microcephaly birth defect in the foetus of a pregnant woman infected with the Zika virus.