A viral race for primacy: co-infection of a natural pair of low and highly pathogenic H7N7 avian influenza viruses in chickens and embryonated chicken eggs.

As expected, highly significant differences between the control groups LP B and HP M6 in survival rates and clinical scores of inoculated animals were observed (each p < 0.001) which confirms the validity of the inoculation and scoring system (Fig. 1 a, b, B vs.

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