我看到是

http://www.cdc.gov/h1n1flu/
Site last updated May 20, 2009, 11:00 AM ET

It's uncertain at this time how severe this novel H1N1 outbreak will be in terms of illness and death compared with other influenza viruses. Because this is a new virus, most people will not have immunity to it, and illness may be more severe and widespread as a result.

有更新的報告嗎？