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. 2022 Mar 9;96(5):e01791-21. doi: 10.1128/jvi.01791-21

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FIG 6 — Hemagglutination inhibition serum antibody titers induced by Fluzone quadrivalent vaccine in vaccinated ferrets. HAI titers were determined for ferrets (n = 15) that were intramuscularly vaccinated twice (days 0 and 28) with 250 μL of the 2019 to 2020 Fluzone quadrivalent seasonal influenza vaccine. Antisera were collected at day 42 post-initial vaccination for HAI assay against vaccine virus components as well as A/California/07/2009 virus. Values are the individual animal HAI titers: (A) A/California/07/2009 (H1N1); (B) A/Brisbane/02/2018 (H1N1); (C) A/Kansas/14/2017 (H3N2); (D) B/Phuket/3073/2013 (B-Vic); (E) B/Colorado/06/2017 (B-Yam). The dotted line indicated the 1:40 HAI titer.