title: Flu is now widespread in 43 US states, CDC reports.
authors.affiliation: Seattle.
authors.forename: Michael
authors.initials: M
authors.lastname: McCarthy
mesh_terms: D002487:Centers for Disease Control and Prevention, U.S.; D004196:Disease Outbreaks; D006801:Humans; D007251:Influenza, Human / Q000453:epidemiology* / Q000517:prevention & control; D011159:Population Surveillance; D014481:United States / Q000453:epidemiology