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Zapalenie gruczołu mlekowego wywołane przez Streptococcus uberis – jak sobie radzić z frustrującym zapaleniem wymienia - Vetkompleksowo – serwis dla lekarzy weterynarii
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Wyszukaj w serwisie


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Zapalenie gruczołu mlekowego wywołane przez Streptococcus uberis – jak sobie radzić z frustrującym zapaleniem wymienia


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Dzięki poprawie skuteczności terapii w nowoczesnych gospodarstwach zmniejsza się liczba przypadków subklinicznego zapalenia gruczołu mlekowego. Kliniczne zapalenie wymienia jest nadal powszechnie występującą i powodującą wymierne straty chorobą w gospodarstwach mlecznych na całym świecie (IDF, 2005; Hogeveen i wsp., 2011). Od kilku lat Streptococcus (Strep.) uberis jest najważniejszym patogenem powodującym kliniczne zapalenia wymienia w wielu krajach na świecie.

Charakterystyka Strep. uberis

Na płytkach z agarem krwistym Strep. uberis rośnie w temperaturze od 30 do 37°C. Kolonie mają średnicę od 1 do 2 mm po okresie inkubacji od 24 do 48 godzin. Dodanie 0,1% eskuliny do pożywki poprawia identyfikację bakterii, ponieważ Strep. uberis i enterokoki hydrolizują eskulinę do glukozy i eskuletyny. Badanie pod światłem ultrafioletowym potwierdza tę reakcję.

Obecnie wiele typowych laboratoriów nie różnicuje selektywnie Strep. uberis. Ze względu na rosnącą presję związaną z kosztami analiz o wysokiej częstości, takich jak badania mikrobiologiczne próbek mleka w kierunku patogenów zapalenia wymienia, identyfikacja jest często ograniczona do paciorkowców hydrolizujących eskulinę, bez różnicowania na Strep. uberis i enterokoki, albo do paciorkowców ujemnych w kierunku eskuliny. Znanych jest kilka czynników zjadliwości Strep. uberis. Niemniej jednak istnieją znaczne różnice w uwidacznianiu się czynników zjadliwości między różnymi izolatami. Tworzenie biofilmu jest ważnym czynnikiem zjadliwości, gdyż może powodować nawracające lub przetrwałe zapalenie gruczołu mlekowego na drodze osłabienia obrony immunologicznej gospodarza i ochrony przeciw substancjom przeciwdrobnoustrojowych. Prawie 100% szczepów Strep. uberis może wytwarzać biofilm w warunkach in vitro. [...]

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Mogą zainteresować Cię również


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Wizytówka firmy


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Sklep


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