What are quadrivalent influenza vaccines against H1N1 influenza (swine flu)?

Updated: Apr 09, 2019
  • Author: Michael Stuart Bronze, MD; Chief Editor: Russell W Steele, MD  more...
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The quadrivalent influenza vaccines contain an additional B strain, B/Phuket/3073/2013-like virus (B/Yamagata lineage), in addition to the 3 viral strains listed above.

Injectable influenza vaccine, which contains inactivated virus, is available in various dosage forms. The intramuscular (IM) form contains 45 µg of influenza hemagglutinin per 0.5 mL. A microinjection system for intradermal delivery (Fluzone Intradermal) is available in the United States and features an ultrafine needle that is 90% shorter than the typical 1- to 1.5-inch needle used for IM injections. The intradermal dosage form contains 27 µg of influenza hemagglutinin per 0.1 mL. [38]

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