title: Flu in circulation.
mesh_terms: D002487:Centers for Disease Control and Prevention, U.S.; D007753:Laboratories / Q000331:legislation & jurisprudence; D009975:Orthomyxoviridae / Q000472:pathogenicity; D017751:Safety Management / Q000331:legislation & jurisprudence* / Q000379:methods*; D013048:Specimen Handling / Q000379:methods / Q000592:standards; D014481:United States; D014773:Virology / Q000331:legislation & jurisprudence / Q000379:methods* / Q000592:standards; D014944:World Health Organization