ALERT LEVELS
WHO ALERT PHASE: 5
Widespread human infection
MOH ALERT SYSTEM: YELLOW
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 63
58 in Mexico; three in US; one in Canada and one in Costa Rica. Officials said the Canadian, U.S. and Costa Rican victims also had other medical conditions.
Confirmed cases: Estimated 5,914 in 33 countries, including at least 2,282 in Mexico, 3,009 in 45 US states, and 358 in Canada.
KEY DEVELOPMENTS
Swiss pharmaceuticals company Roche Holding AG says it's donating enough Tamiflu to WHO to treat 5.65 million people. Tamiflu is one of two anti-viral drugs effective against swine flu.
China says it has tracked down and quarantined most passengers who were on flights with the mainland's first confirmed case. The man is a Chinese graduate student at the University of Missouri and became ill while returning to China.
A study published in the journal Science estimates Mexico may actually have had 6,000 to 32,000 cases. It also estimated Mexico may have had 23,000 cases by April 23, the day it announced the epidemic. The study estimates that between 0.4 per cent and 1.4 per cent of swine flu cases are fatal.
WHO says up to 2 billion people could be infected if outbreak eventually turns into pandemic. But WHO flu chief Keiji Fukuda says it's too early to tell how widespread or severe the outbreak will become.
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