WHO warns of severe form of swine flu

Some countries are reporting that as many as 15 percent of patients hospitalized with the new H1N1 pandemic virus need intensive care, further straining already overburdened healthcare systems, WHO said in an update on the pandemic.

"During the winter season in the southern hemisphere, several countries have viewed the need for intensive care as the greatest burden on health services," it said.

"Preparedness measures need to anticipate this increased demand on intensive care units, which could be overwhelmed by a sudden surge in the number of severe cases."

Earlier, WHO reported that H1N1 had reached epidemic levels in Japan, signaling an early start to what may be a long influenza season this year, and that it was also worsening in tropical regions.

"Perhaps most significantly, clinicians from around the world are reporting a very severe form of disease, also in young and otherwise healthy people, which is rarely seen during seasonal influenza infections," WHO said.

"In these patients, the virus directly infects the lung, causing severe respiratory failure. Saving these lives depends on highly specialized and demanding care in intensive care units, usually with long and costly stays."

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