UPDATE 2-Singapore confirms Zika spread; U.S. and other countries issue travel warnings
* 26 more Zika cases confirmed in past 24 hours
* Pregnant women advised to avoid travel to Singapore
* Malaysia, Indonesia step up Singapore arrivals checks
* Singapore says premature to determine impact on tourism
* Nationalities of infected foreign workers undisclosed (Recasts; adds U.S. travel warning, background and medical expert comment)
By Marius Zaharia
SINGAPORE, Aug 30 (Reuters) - Confirmed cases of Zika virus in Singapore rose to 82 on Tuesday, as the United States joined a growing list of countries warning pregnant women or those trying to get pregnant to avoid travel to the city-state.
The mosquito-borne Zika virus, which has caused explosive outbreaks in the Americas and the Caribbean since late last year, poses a particular risk to pregnant women because it can cause microcephaly, a severe birth defect in which babies are born with abnormally small heads and underdeveloped brains.
On Tuesday, the United States warned pregnant women not to travel to Singapore, joining Australia, Taiwan and South Korea. Continuación...