Studies on respiratory affections in cattle

Clinical examination revealed that all affections were confined in 62 out of 153 dried nonpregnant cows, 55 of them showed respiratory symptoms including cough, nasal discharge and different abnormal sounds auscultated in the lungs. Moreover, 7 cows suffered from the same respiratory symptoms in addition to encapsulated subcutaneous abscesses of painful nature. Eleven cows died, postmortem findings showed either mucoid, mucopurulent or purulent discharge in the upper respiratory tract, different stages of pneumonia, multiple abscesses of variable size [3-10 cm diameter] on the surfaces of lungs and livers and yielded thick creamy pus, enlarged liver and congestion of the intestinal mucosa. Examination of blood films during fever revealed bipolar organisms. Bacteriological examination revealed isolation of Pasteurella multocida and /or Actinomyces pyogenes. Antibiogram determination indicated that P. multocida isolates were sensitive to gentamicin [75.69%], erythromycin [53.45%]. trimethoprimplus sulfa [51.72%], nalidxic acid [50%], while the A. pyogenes isolates were highly sensitive to gentamicin [100%], flumequine [96.96%], nalidixic acid [75.74%], erythromycin [63.63%] and cephalothin [60.6%]. Trials for isolations of virus, mycoplasma, fungus revealed negative results

Isolation, Identification and sero conversion studies on BRSV in Egypt

In the present survey 250 nasal swabs and 400 sera samples were collected from calves, feed lot and diary cattle with different ages, seasons and different degree of respiratory signs, for BRSV isolation, identification and serodiagnosis. In addition to 150 calves apparently normal contact animals were examined. The collected samples represented six farms distributed throughout five Egyptian governorates. The obtained results proved that, 5 out 7 virus isolates were from calves 1-6 months old and another 2 isolates from unweaned calves 2-3 weeks old, 6 isolates were detected in spring season while, only one during winter season. Only 3 out of 7 titrated viral isolates were identified as BRSV by SNT and one more by direct FAT. The isolated strains were designated as RBSV Salhai 1994 and RBSV Alexandria 1994. The serodiagnosis results of 400 examined sera samples by SNT and ELISA revealed that 65 [16.25%] and 110 [27.5%] sera samples were positive, respectively. The antibodies titer ranged from 1/8 to 1/64. Maternal immunity through seroconversion study showed a fading of passive immunity completely at 5th month of age