Infection of ducks and chickens by inoculation or contact with HP VN/1203/K (K) and HP VN/1203/E (E).

AVirus isolation from oral swabs in Vero cells. The days pi for the contact-infected birds reflect the days post placement.BDiseased birds were euthanized when clinical signs developed and are included in mortality and mean time to death (MTD). MTD for contact-infected ducks is calculated from the time of placement. The total lesions include histopathology at termination.CVirus isolations at 5 days pi were significantly different between the contact-infected groups as indicated by different minor case superscript letters (two-tailed Fisher's exact test).DNot tested (…) or not applicable (NA).