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Table 1 Evaluation of vaccine efficacy for protection of ducks from H9N2 viruses

From: Protective efficacy of an inactivated vaccine against H9N2 avian influenza virus in ducks

Days of post-vaccination Number of ducks Immunization Virus isolation from oropharyngeal swabs (mean EID50/ml)
(weeks)    2 dpi 3 dpi
3 5 Vaccine
3 5 PBS 1.75 1.45
37 10 Vaccine
37 5 PBS 1.75 1.50
  1. dpi, days post-infection, PBS, phosphate-buffered saline (negative control)