On guard

Policemen wearing face masks to prevent contagion by the swine flu virus, stand at the entrance of a Government building in Mexico City. The World Health Organization said there was no reason to raise a pandemic flu alert to the highest level as the epidemic had remained steady. But WHO acting Assistant Director General Keiji Fukuda added a note of caution about developments in the southern hemisphere, which is entering into the flu-prone winter season.

( AFP/Getty photo by Eitan Abramovich / April 30, 2009 )

Policemen wearing face masks to prevent contagion by the swine flu virus, stand at the entrance of a Government building in Mexico City. The World Health Organization said there was no reason to raise a pandemic flu alert to the highest level as the epidemic had remained steady. But WHO acting Assistant Director General Keiji Fukuda added a note of caution about developments in the southern hemisphere, which is entering into the flu-prone winter season.

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