Risk of import into Singapore elevated. Isolated imported cases may occur but there is no sustained transmission.
SUSPECTED AND CONFIRMED CASES
Deaths: Global total of 53
48 in Mexico; three in the US; one in Canada and one in Costa Rica. One of those who died in the U.S. was a toddler from Mexico. Officials said the Canadian, US and Costa Rican victims also had other underlying medical conditions.
Confirmed cases, according to WHO and CDC: More than 4,500 in at least 29 countries, including at least 1,626 in Mexico, at least 2,532 in the United States and 286 in Canada.
KEY DEVELOPMENTS
Third US death was a man in his 30s in Washington state, where health officials said he had underlying heart conditions.
Japan reports its first four cases: a teacher and three students who had been on a high school trip to Canada. China confirms its first case on the mainland. Australia reported its first confirmed case Saturday.
WHO says up to 2 billion people could be infected by swine flu if outbreak turns into pandemic over months or years. But WHO flu chief Keiji Fukuda says it's too early to tell how widespread or severe the outbreak will become.
President Barack Obama seeks to reassure Hispanics that swine flu won't lead to an epidemic of discrimination in the United States just because Mexico has been the center of the outbreak.
Mexico's U.N. envoy says nations need common rules for responding to flu outbreaks to prevent discrimination and unfair trade restrictions; says Mexicans unfairly singled out.
High schools, universities, dance halls, movie theaters and bars have reopened across Mexico. Most primary schools will reopen on Monday.
CDC says only about 10 percent of Americans with swine flu are believed to have gotten it during trips to Mexico.
