A recent surge in human infections caused by bird flu viruses and a proliferation of the types of animal flu viruses sparking infections in people are events that need to be watched, the World Health Organization said Thursday.
A new report shows this winter's nasty flu season has peaked and is clearly retreating in the U.S. But flu-related hospitalization rates in people 65 and older are the highest since the government started tracking them nine years ago.
The flu is now widespread in all but seven states, and hospitalization rates match the dismal season two years ago. While U.S. health officials fear this will be an unusually bad year, it's too soon to say.
Flu season is hitting hard across North America, with the U.S. Centers for Disease Control and Prevention declaring this week that the proportion of deaths attributed to the flu and pneumonia have reached an 'epidemic threshold.'
Laboratory-confirmed influenza cases 'increased sharply' for the third straight week, the Public Health Agency of Canada reported Friday, just as Canadians are hugging and kissing their way through holiday party season.