“H1N1 flu activity seems to have leveled off,” according to the CDC, but vaccination “remains a good idea.”

In an online briefing, Dr. Anne Schuchat, the agency’s director for immunization, added that most current flu activity is from the 2009 H1N1 virus and that “we’re not seeing seasonal flu strains yet in any substantial numbers.” She said that although some people believe the H1N1 outbreak is over, “it’s too soon for us to have that type of complacency.”

Dr. Schuchat reported that vaccine safety monitoring has been “extremely reassuring.”