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Survival of 4-week-old chickens after intranasal inoculation with one of two HPAI viruses or an LPAI virus. Shown is the percent survival of chickens inoculated with CkYM7 (H5N1), DkYK10 (H5N1), or CkIB1 (H5N2) or mock inoculated. The remaining chickens were observed for clinical signs and gross lesions twice a day through a 10-day observation period.
