One or more of the following: cloacal or choanal swabs, 1 g fresh tissue (placenta, liver, spleen, air sac), 1 g avian feces.
Moist swabs are preferred; it its recommended to add 1-2 drops of sterile saline to the swab and place in a sterile, leak-proof container (e.g. red top tube). Bacterial culture swabs submitted in bacterial culture media (gel, charcoal, etc.) are not suitable for PCR testing. Fresh samples provide the most accurate results.