A thermal camera monitors the body temperature of passengers arriving from overseas against the... 
(AP)
Canada became the third country to confirm human cases of swine flu Sunday as global health officials considered whether to raise the global pandemic alert level.
Nations from New Zealand to Spain also reported suspected cases, and some warned citizens against travel to North America while others planned quarantines, tightened rules on pork imports and tested airline passengers for fevers.
The six Canadian cases in Nova Scotia and British Columbia all had links to people who had traveled to Mexico, and all are the same swine flu strain. The six people have recovered, said Dr. David Butler-Jones, Canada's chief public health officer.
But "these are probably not the last cases we'll see in Canada," he said.
The news follows the World Health Organization's decision Saturday to declare the outbreak first detected in Mexico and the United States a "public health emergency of international concern."
A senior World Health Organization official said the agency's emergency committee will meet for a second time Tuesday to examine the spread of the virus before deciding whether to increase the alert for a possible pandemic, or global epidemic.
The same strain of the A/H1N1 swine flu virus has been detected in several locations in Mexico and the United States, and it appears to be spreading directly from human to human, said Keiji Fukuda, WHO's assistant director-general in charge of health security.
Mexico's federal health secretary says the disease has killed 103 people and likely sickened more than 1,600 since April 13. U.S. officials say the virus has been found in New York, California, Texas, Kansas and Ohio, but no fatalities have been reported.
Governments including China, Russia and Taiwan began planning to put anyone with symptoms of the deadly virus under quarantine.
Others were increasing their screening of pigs and pork imports from the Americas or banning them outright despite health officials' reassurances that it was safe to eat thoroughly cooked pork.
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