So Far, No "Red Flags" Seen In H1N1 Vaccine, National Institute of Allergy And Infectious Diseases (NIAID) Announce Published: Aug 24, 2009 CHICAGO (Reuters) - Clinical trials for the new swine flu vaccine have turned up no red flags, U.S. health officials said on Friday. Related links HealthDay This will open in a new window Reuters This will open in a new window Email this Facebook Twitter LinkedIn Pinterest Reddit Back to news