H1N1 Returning?

CDC officials concerned H1N1 might make comeback.
The Washington Post (2/23, HE1, Brown) reports, "Even as officials from the Centers for Disease Control and Prevention are announcing that the epidemic of the H1N1 flu is no longer widespread in any state, no disease expert is willing to say there isn't a third -- or fourth -- wave of swine flu in the country's future. Anne M. Schuchat, "who is leading the government's response to the H1N1 pandemic at the CDC," said, "We are not at all out of the woods because the virus continues to circulate, but the chances of a very large additional wave are very hard to predict."
H1N1 may have infected at least 63 million Americans last year. Bloomberg News (2/23, Gale) reports, "Swine flu may have infected at least 63 million people in the US last year, according to" a University of Pittsburgh study appearing in PLoS Currents. "Blood tests on Pittsburgh residents found 45 percent of people aged 10 to 19 years had antibodies against the new H1N1 flu strain," and nearly "22 percent of people across all groups developed immunity to the virus by early December." In addition, "a quarter of those born in the 1920s may have already had protective antibodies before the pandemic resulting from prior flu infection," all of which suggests that "a fresh wave of swine flu infections isn't likely unless the virus mutates or people become more susceptible to infection."
FDA committee says 2010-2011 seasonal flu shot to include H1N1 protection. Bloomberg News (2/23, Randall) reports, "Protection against swine flu will be added to the 2010-2011 seasonal influenza vaccine, putting an end to separate shots deployed against the pandemic, according to a US Food and Drug Administration advisory committee." Because the "previous strain of H1N1 'most likely poses a low risk in the forthcoming Northern Hemisphere season,'" the CDC's Nancy Cox "said...at the panel hearing" that a "new strain of H1N1 will be added."