Avian metapneumovirus (aMPV), causes an acute, highly contagious upper respiratory tract infection of turkeys and chickens. In turkeys, the virus causes a disease known as turkey rhinotracheitis. This disease can occur from a very young age in turkeys and is characterised by snicking, rales, sneezing, nasal discharge, foaming conjunctivitis, swelling of the infraorbital sinuses and submandibular edema. Secondary adventitious agents can dramatically exacerbate the clinical signs.
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