Fig 1. Virus shed detected by qRRT-PCR from 3 week-old chickens directly inoculated with 10⁶ 50% egg infectious doses per bird of H7N8 avian influenza viruses.

A) Oropharyngeal swabs from low pathogenic avian influenza virus exposed birds (n = 17); B) Cloacal swabs from low pathogenic avian influenza virus exposed birds (n = 17); C) Oropharyngeal swabs from highly pathogenic avian influenza virus exposed birds (n = 17); D)) Oropharyngeal swabs from highly pathogenic avian influenza virus exposed birds (n = 17). Bars represent mean and standard deviation; a dotted line represents the approximate limit of detection; samples where virus was not detected are shown at the limit of detection.