Swine flu characteristics becoming more evident

As swine flu continues to spread around the globe, a clearer picture of the most serious cases has started to emerge, indicating that the virus could pose a greater threat to some otherwise healthy people. The virus can cause life-threatening viral pneumonia much more commonly than the typical flu, prompting the World Health Organization to warn hospitals to prepare for a possible wave of very sick patients and to urge doctors to treat suspected cases quickly with antiviral drugs.