Global health officials stepped up defensive measures against Zika over the weekend as the virus continued to expand its reach at a rapid pace.
Singapore reported one of the largest single clusters outside the Americas, confirming 56 infections, mostly among foreign workers at a construction site. On Monday, inspectors armed with insecticide were visiting high-rise public housing buildings to look at toilets and other areas for stagnant water, according to Agence France-Presse.