بررسی تغییرات هیستوپاتولوژیک و پاسخ ایمنی جوجه‌های عاری از عوامل بیماری‌زای خاص (SPF) پس از واکسیناسیون با واکسن‌های برونشیت عفونی ژنوتیپ‌های GI-1,GI-13و GI-23

نوع مقاله : مقاله پژوهشی

نویسندگان
1 بخش تحقیق و تولید واکسنهای طیور، موسسه تحقیقات واکسن و سرم سازی رازی، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرج ، ایران
2 محقق بخش پاتولوژی و اپیدمیولوژی دام، موسسه تحقیقات واکسن و سرم‌سازی رازی، سازمان تحقیقات آموزش و ترویج کشاورزی، کرج، ایران
10.22034/ijvcs.2026.15000.1098
چکیده
بیماری برونشیت عفونی با واکسنهای زنده یا غیرفعال کنترل می شود اما آیا این واکسنها با وجود بررسیهای متعدد در خصوص ایمن بودن برای جوجه عوارضی مانند مشکلات تنفسی ممکن است در فیلد ایجاد نمایند. هدف از این مطالعه ارزیابی آسیب شناسی و پاسخ ایمنی ناشی از واکسن با رژیم واکسیناسیون رایج در یک روزگی در جوجه های عاری از عوامل بیماریزای خاص(SPF) بود. 4 گروه 20 تایی جوجه SPF در روز اول پس از تفریخ به روش بینی-چشمی با دو واکسن از دو سروتیپ ماساچوست و 793/B و نیز یک گروه ماساچوست با واریانت2 محصول شرکتهای مختلف واکسن به صورت دی والان واکسینه شدند. گروه کنترل تنها همین مقدار سرم فیزیولوژی دریافت نمود.فعالیت مژکهای تنفسی، پاسخ پادتنی و تغییرات آسیب شناسی بافتهای نای و کلیه و ریه در روزهای 5 و 8 پس از واکسیناسیون مورد ارزیابی قرار گرفت. پاسخ پادتنی در همه گروههای تیمار پس از واکسیناسیون افزایش مشهود داشت اما بیشترین تیتر در گروه واکسن H120 + واریانت2 بود. ضایعات آسیب شناسی از پرخونی، دژنراسیون تا کنده شدن سلولهای اپی تلیال و سپس هایپرپلازی مخاط در همه گروهها در نای، ریه و کلیه مشهود بود. از نتایج این مطالعه می توان نتیجه گرفت واکسن برونشیت علاوه بر تحریک ایمنی ضایعاتی ایجاد می کند که با تمایل سویه ویروس به بافت هدف هماهنگ بوده و این امر باید مورد توجه مرغداران و دامپزشک مزرعه هنگام تزریق واکسن قرار گرفته و با درمانهای حمایتی یا پیشگیرانه از بروز عفونتهای ثانویه باکتریایی یا تلفات جلوگیری به عمل آید.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Investigation of Histopathological Changes and Immune Response of Specific Pathogen-Free (SPF) Chickens after Vaccination with Infectious Bronchitis Vaccines of Genotypes GI-1, GI-13 and GI-23

نویسندگان English

Najmeh Motamed 1
Mohammad Islampanah 2
1 Department of Poultry Vaccine Production, Razi Vaccine and Serum Research Institute, Agricultural Research Education and Extension Organization, Karaj, Iran
2 1Department of Pathology and Epidemiology, Razi Vaccine and Serum Research Institute, Agricultural Research, Education and Extension Organization, Karaj, Iran
چکیده English

Infectious bronchitis is controlled by widespread vaccination with live or inactivated vaccines, but despite numerous studies on their safety for chicks, these vaccines may cause complications such as respiratory problems in the field. The aim of this study was to evaluate the pathology and immune response induced by the vaccine with the current vaccination regimen at one day of age in specific pathogen-free (SPF) chicks. Four groups of 20 SPF chicks were vaccinated intranasally on the first day after hatching with two vaccines from two serotypes, Massachusetts and 793/B, and one group of Massachusetts with variant 2 from different vaccine companies as a bivalent vaccine. Respiratory ciliary activity, antibody response, and pathological changes in tracheal, kidney, and lung tissues were evaluated on days 5 and 8 after vaccination. Antibody response increased significantly in all treatment groups after vaccination, but the highest titer was in the H120 + variant 2 vaccine group. Pathological lesions ranging from hyperemia, degeneration to detachment of epithelial cells and then mucosal hyperplasia were evident in all groups in the trachea, lungs and kidneys. It can be concluded that the bronchitis vaccine, in addition to stimulating immunity and protection, produces lesions that are consistent with the affinity of the virus strain to the target tissue, and this should be taken into account by poultry farmers and farm veterinarians when injecting the vaccine and the occurrence of secondary bacterial infections or deaths should be prevented with supportive or preventive treatments.

کلیدواژه‌ها English

Trachea
Kidney
Histopathology
Antibody
Protection
Strain
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دوره 20، شماره 1 - شماره پیاپی 34
بهار و تابستان 1405
شهریور 1405
صفحه 21-33