Influenza activity remained elevated in the United States, but decreased in most areas and some states have minimal activity, federal health officials said.
The number of U.S. adults who reported having the flu on any day in January suggests the 2012-13 flu season may be the worst in five years, a survey indicated.
Influenza is down in most states but still widespread and elevated in the United States, federal health officials said.
The U.S. flu season, which began earlier than usual, will end earlier than usual, federal officials said.
Federal officials say influenza-like-illness activity has dropped in the East and risen sharply in the West a little more than halfway through the flu season.
Planning for an influenza pandemic means preparing for surprises and responding rapidly under conditions of uncertainty, a British researcher says.
Influenza in Europe: 17 countries reported increasing transmission, while five countries reported decreasing rates, but flu was more widespread, officials say.
A U.N. study said at least one-in-five people, including half of school-age children, were infected with swine flu in the first year of the pandemic in 2009.
Influenza is waning in the South, Southeast, New England and Midwest but increasing in the Southwest and Northwest, officials say.
Influenza activity continued to increase across Europe during the second week of January with reports of severe cases in some countries, officials say.