الفهرس 
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Abstract
Respiratory disease considered one of the most causes of economic
loss in cattle industry especially due to bacterial and mycoplasmal
infection.
A total of 556 samples were collected from cattle from different cattle
farms and slaughter houses at Sharkia, Cairo Govemorate, Egypt, including
169 nasal swabs, 129 tracheal samples, 129 lung and 129 bronchial lymph
nodes. The highest incidence was from bacteria 37.9%, followed by
Mycoplasma (17%), Acholeplasma (10.8%), while mixed infection was
(21.4%), Mycoplasma species was isolated by percentage of (17%).
Diseased cattle revealed the highest incidence than apparently healthy one
reaching 22.6%, 9.9% respectively. The highest isolation rate was from
lung of diseased and apparently healthy animals 24.8%, while lymph nodes
showed the lowest isolation rate 10%.
Biochemical identification revealed that M arginini was the highest
incidence by percentage of 7%, followed by M bovis 6.5%, M bovithinis
1.9% while the lowest incidence was from M bovigenitslium 1.6%.
Bacteria species were isolated by percentage of 37.9%. The incidence
of bacteria from diseased cattle were 43% while from the apparently
healthy one were 30.9%, nasal swabs revealed the highest incidence of
bacteria reaching 45.5%, while bronchial lymph nodes were the lowest
incidence reaching 26.3%.