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Choroby zakaźne osłabiające sprawność układu...
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Wyszukaj w serwisie


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Choroby zakaźne osłabiające sprawność układu odpornościowego świń


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Stan immunosupresji może wywoływać u świń wiele czynników, w tym czynniki zakaźne. Patogeneza i obraz kliniczny chorób będących skutkiem immunosupresji różnią się w zależności od ich pierwotnej przyczyny. Zakażenia drobnoustrojami powodującymi osłabienie odpowiedzi immunologicznej świń skutkują najczęściej występowaniem zespołów chorobowych, które manifestują się złożonym obrazem klinicznym i sekcyjnym, powodują poważne straty ekonomiczne, ponadto w ich przebiegu można jednocześnie wyizolować wiele czynników chorobotwórczych, w tym niejednokrotnie drobnoustroje saprofityczne, które w normalnych warunkach nie są patogenne dla świń.

W ostatnich latach za najważniejsze, z punktu widzenia ekonomicznego, patogeny świń wywołujące immunosupresję uznawane są: wirus zespołu rozrodczo-oddechowego, cirkowirus świń oraz Mycoplasma hyopneumoniae.

Zespół oddechowy świń 

Głównymi czynnikami odpowiedzialnymi za wystąpienie zespołu oddechowego świń (porcine respiratory disease complex, PRDC) są: PRRSV, PCV oraz Mhp (9). Wzajemne oddziaływanie patogenów współuczestniczących w zakażeniu skutkuje zwykle zaostrzeniem objawów, np. udział Mhp przy równoczesnym zakażeniu PRRSV lub PCV2 pogłębia proces chorobowy (4, 20).

Kim i wsp. (11), badając 105 świń w celu identyfikacji patogenów biorących udział w PRDC, stwierdził, że u 80 świń występowały koinfekcje. Aż 55% przypadków stanowiły jednoczesne zakażenia PRRSV i PCV2, co histologicznie widoczne było jako postępujące nekrotyczne zapalenie płuc. U 56 zwierząt (53%) były to mieszane zakażenia wirusowo-bakteryjne, a najczęściej spotykaną kombinacją było występowanie Mhp z PCV2, które zarejestrowano u 33 świń. Koinfekcje PRRSV, Mhp i PCV2 stwierdził także Ellis i wsp. (6), zaś koinfekcje [...]

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Mogą zainteresować Cię również


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Wizytówka firmy


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Sklep


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