Vaccines that protect against four strains of flu proved just as effective in clinical trials as traditional ones that protect against three, two vaccine companies announced Monday. The new mixtures protect against two different B strains, scientists from Sanofi Pasteur and GlaxoSmithKline Biologicals said at a medical meeting in San Diego. The B strains are rarer and usually arrive later in the season than the A strains, like A(H1N1), but they cause more hospitalizations and deaths. Until 1978, flu vaccines contained only one A and one B strain; a second A was added to fight A(H3N2), which had first emerged as the 1968 Hong Kong Flu. Two distinct B strains, known as Victoria and Yamagata, have existed since 2002, but it has been hard to predict a dominant one each year. The new quadrivalent vaccines, which are being evaluated by the Food and Drug Administration and are not approved for the public, are meant to lower that uncertainty.
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National Briefing | Health: Flu Vaccine Effective Against 4 Strains, Study Finds
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