Role of various species of mycoplasma and bacteria in turkey's sinusitis with description of pathological picture

الملخص EN

The current work was carried out to clear-up the probable causes responsible for signs of infraorbital sinusitis with embryonic deaths of the fertile eggs in a multiple-age turkey's farm located in El-Mania Governorate, Upper Egypt.

Clinical and necropsy examinations, and serological testing in association with conventional culturing procedures and molecular diagnosis (PCR) indicated that Mycoplasma gallisepticum (MG), either alone or coupled with other pathogens (Pasteur Ella multocida and Escherichia coli) was the predominant etiologic agent responsible for the respiratory problems including infraorbital sinusitis of the infected turkey flocks.

The presence of MG infection in upper and lower respiratory tracts facilitates the portal entry of Pasteur Ella multocida infection to invade the lower respiratory tract and distributed systematically.

This may increase the severity of the respiratory signs and increased the shedding rate of the in-ova transmission of MG infection, which reduced the hatchability rate with dramatic embryonic death of the fertile eggs.

Experimentally, in-ova infection in fertile turkey's eggs with an MG-isolate isolated from the examined fertile eggs and organs of the naturally infected flock was carried out.

Gross lesions and the histopathologically alterations of the inoculated embryos were monitored during the period of experiment.

Eight-days post inoculation, 28 % of the inoculated fertile eggs were succumbed.

Diffuse edematous swellings and signs of dwarfisms particularly shortening legs (macromedia), in association with hyper-thickening of the membranes were obviously remarked in the inoculated embryos.

The thickening of membranes was increased by increasing the days of incubation.

Histopathologically examinations of the experimentally inoculated embryos with MG (on the 3rd, 6th and 8th days post-inoculation) were described in detail.