The swollen head syndrome is one of the most upper respiratory problems in poultry that causing high economic loss in poultry,SHS is infected of all ages mainly 4-6 weeks old with morbidity may reach to 10% and mortality about 2%, Avian metapneumovirus (aMPV)Is one of the most important etiological factors that causing swollen head syndrome (SHS), (aMPV) is a member of sub family Pneumovirinae under the family Paramyxoviridae, also this family characterized by RNA non segmented negative sense genome, Ornithobacteriumrhinotracheale (ORT) It is one of most important etiological factor of (SHS) is one of a contagious disease that capable to infect avian species, primarily in turkeys and chickens, causing marketable respiratory distress, decreased growth, and mortality will be depending on many factors like combination with viral infection like aMPV. Study the effect of vaccinated flocks with (ND, IB, IBD) with identification of Avian metapneumovirus (aMPV) and Ornithobacteriumrhinotracheale (ORT), in middle Euphrates region in Iraq.
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