While critics say the alert system is in need of repair, with the A(H1N1) virus proving milder than other flu strains, experts are watching developments in Australia, Britain, Chile and Japan especially carefully.
The World Health Organisation held talks Wednesday with those countries worst hit, seeking "undisputable" evidence of domestic human transmission, after a senior official said Tuesday its highest, level-six alert phase was "very, very close" to being called.
"I can confirm that the DG (director-general) is consulting with the ministries of health of seven or eight of the most affected countries to try to see if there is undisputable evidence of community spread," WHO spokeswoman Fadela Chaib told AFP.
Since the A(H1N1) virus was first discovered in the United States and Mexico April, some 74 countries have reported 27,737 cases including 141 deaths to the health agency.
According to the WHO's latest tally of flu cases published Wednesday, Chile reported 1,283 more infections, including one new death, bringing its total caseload to 1,694.
Britain added 109 new infections, bringing its total to 666, while Australia reached 1,224, including 173 new cases. Japan also reported 75 new infections, taking its total to 485.
The Palestinian territories confirmed their first case in a four-year-old boy who returned to the West Bank from the United States five days ago.
Fears are currently greatest in the southern hemisphere, with the onset of its winter season.
Frequent flyers and people in large crowds remain particularly at risk -- indeed Australian Rugby league players could be in and out of quarantine for months, authorities said.
Friday's National Rugby League game between the Brisbane Broncos and the Canterbury Bulldogs is under threat awaiting test results on Broncos fullback Karmichael Hunt.
Senior WHO official Ian Barr predicted all sport would eventually be hit.
"It won't just be the Broncos or rugby league clubs, it will be all sporting activities that will be compromised or their sporting schedule interrupted," Barr, deputy director of WHO's influenza centre, said on Wednesday.
"The players are all susceptible, especially if they are sitting next to somebody on a plane for a few hours."
Swimming Australia said Tuesday it was shelving this month's Grand Prix in Melbourne.
Around the world, a 24-year-old woman became the first person in Colombia to die of swine flu.
In China, New Orleans Mayor Ray Nagin was released from quarantine in Shanghai, where he had been detained since Sunday after a fellow passenger on his flight fell ill with a suspected case of swine flu.
Nagin, known for being mayor of New Orleans during Hurricane Katrina in 2005, missed several meetings in the Chinese business hub due to the quarantine but will make it to two speaking engagements in Australia Thursday and Friday.
In a statement, Nagin thanked Shanghai medical and city officials and said he was leaving China "in the best of health and spirits."
China has submitted passengers to temperature checks and at times quarantine at its airports in a bid to stop the spread of swine flu.
Those placed under quarantine have usually been released after a seven-day observation period, but the country's strict control measures have faced foreign criticism.
Egypt, Romania, the Czech Republic and Vietnam national authorities all reported new infections Wednesday, while health chiefs in Hong Kong and Poland each signalled their first cases of human swine flu where those infected had caught the virus locally.
Source : AP
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