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Hemagglutination inhibition (HI) titre (log 2) of avian influenza H5 antibodies. Geometric mean of 12 serum samples per group (four/replicate) at each observation time. Different letters at each observation time indicate to significant difference (P < 0.05). CV% range was 7.2 to 19%. CV%, coefficient of variation percentage; EO, essential oil; NC, negative control; VC, vaccinated and challenge; VTC, vaccinated, EOs treated, and challenged.
