Washington state health officials said a man in his 30s is the first person in the state to die from what appears to be complications of so-called swine flu.
The state Department of Health said in a news release that the Snohomish County man, who had underlying heart conditions, died last week.
The man was not identified.
There have been more than 4,150 confirmed cases in 29 countries of influenza from the H1N1 virus. There have been 48 deaths in Mexico, three in the U.S., one in Canada and one in Costa Rica. Officials said the Canadian, U.S. and Costa Rican victims all had other underlying medical conditions.