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The prevalence of Infectious Bronchitis (IB) in some chicken farms in Egypt: iii Cross protection ofvaccinated chickens versus field IB virus [electronic resource]

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Kamel, K. M

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Language: English Summary language: Arabic Description: p.351-363Other title:

مدى إنتشار مرض الالتهاب الشعبي المعدي فى قطعان الدجاج:‪ 3مدي الحماية المتوفرة باستخدام لقاح H120 على الوقاية من بعض العترات الحقلية .‪ [Added title page title]

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Beni-Suef veterinary medical journal, 2010 v. 20 (1), Special issue [electronic resource]:

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In: Beni-Suef Veterinary Medical Journal. Beni-Suef Vetrinary Medicen Journal November 2010, 6th Scientific conference 2010.v.17(1)(Special issue)Summary: Four groups of one-day-old SPF chicks were inoculated with the four IBV variants at 1 day old to study the virulence of these isolates. The results at 2 weeks post infection (PI) revealed that all isolates were able to induce serological resposne postinfection, respiratory distress and depression. 20% and 100°.4 mortalities were recorded with isolates 4 and 23; respectively. Assessment of pathogenicity index and pathotyping (at the end of observation period "2wk-PI"h categorized the 4 tested isoaltes (4. 16,18,13) into three isoahes of high virulence (4, 18 and 23), and one isolate of intermediate virulence (16). About 50°.4 reduction in body weight was recorded with the four IBV isolates 1 wk PI. Kidney lesions were nephritis·nephrosis with urate deposition in ureters, while microscopic lesions were associated with increase in the amount of rough endoplasmic reticulum (RER). Tracheal lesions recorded as increase the amount of mucin, while microscopic lesions were edema of mucosa and inflammatory ceUs in the lamina propria.

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Four groups of one-day-old SPF chicks were inoculated with the four IBV variants at 1 day old to study the virulence of these isolates. The results at 2 weeks post infection (PI) revealed that all isolates were able to induce serological resposne postinfection, respiratory distress and depression. 20% and 100°.4 mortalities were recorded with isolates 4 and 23; respectively. Assessment of pathogenicity index and pathotyping (at the end of observation period "2wk-PI"h categorized the 4 tested isoaltes (4. 16,18,13) into three isoahes of high virulence (4, 18 and 23), and one isolate of intermediate virulence (16). About 50°.4 reduction in body weight was recorded with the four IBV isolates 1 wk PI. Kidney lesions were nephritis·nephrosis with urate deposition in ureters, while microscopic lesions were associated with increase in the amount of rough endoplasmic reticulum (RER). Tracheal lesions recorded as increase the amount of mucin, while microscopic lesions were edema of mucosa and inflammatory ceUs in the lamina propria.

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