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. 2017 Jan 30;12(1):e0170681. doi: 10.1371/journal.pone.0170681

Fig 1. Serum hemagglutination inhibition (HI) levels in vaccinated-challenged ducks.

Fig 1

Serum samples (20 ducks per group) were collected at 7-, 14-, 21- and 28-day post-vaccination, and at 3-, 5- and 7-day post-challenge. Antibody titers were determined using the HI assay with 4 HA units of the SIC12/13, SIC9/13 and SIC10/13 avian influenza virus strain, respectively. The HI titer is expressed as the log2 form.Bars indicate mean ± SEM of a representative experiment. (*P<0.05, **P<0.01, ***P<0.001). Experimental groups are as in Table 2.