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ANALISIS PENYAKIT VIRAL

ANALISIS PENYAKIT VIRAL. PATHOGEN. HOST. Infectivity Virulence Pathogenicity Viability strain. Species Age Strain Nutrional status Physiological condition Population density. Disease Potential. ENVIRONMENT. Faktor-Faktor Penyebab Infeksi. Environment Oxygen concentration

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ANALISIS PENYAKIT VIRAL

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  1. ANALISIS PENYAKIT VIRAL

  2. PATHOGEN HOST Infectivity Virulence Pathogenicity Viability strain Species Age Strain Nutrional status Physiological condition Population density Disease Potential ENVIRONMENT Faktor-Faktor Penyebab Infeksi Environment Oxygen concentration Water alkalinity Water hardness Other water quality parameters season Sumber : Plumb, JA , 1994

  3. Lingkungan dapat menjadi stressor, bila: • kadar amonia • kandungan logam berat • oksigen rendah • CO2 tinggi • perubahan pH dan temperatur ekstrim

  4. Bagaimana respon host terhadap stressor ??? • tergantung : • berat / ringan dari stressor • lama paparan dengan stressor • Bagaimana efek stressor host : • Mati jika stressor berat • Mampu beradaptasi jika stressor ringan • Perubahan fisiologis

  5. Interaksi antara host, pathogen dan lingkungan dlm menimbulkan penyakit • Snieszko : H (A + S2) = D dimana : H = host A = agen penyebab S = stressor lingkungan D = disease

  6. Kontribusi ketidakseimbangan hub. host dan patogen : • manajemen kurang  lingkungan sebagai stressor  kekebalan tubuh menurun • nutrisi rendah  kekebalan tubuh menurun  infeksi berkembang menjadi penyakit

  7. Faktor-faktor apa yang mempengaruhi perkembangan penyakit ??? • Sumber infeksi • Ikan yg terinfeksi • Ikan carrier • Telur, air, pakan, peralatan yang terkontaminasi • Cara transmisi  terkait dng sumber infeksi • Portal of entry • Virulensi organisme patogen • Kekebalan alami host

  8. Portal of entry Reservoir (Fish) Sumber : Plumb, JA , 1994 Route of Transmission Portal of exit Direct, Vehicle Vector Direct, Vehicle Vector Portal of exit Route of Transmission Susceptible Host (Fish) Portal of entry

  9. Apa yang diperlukan untuk menganalisis penyakit ?? • Case history • Pola mortalitas  menggambarkan penyebab mortalitas • Agen infeksius ?? • Kualitas air ?? • Bahan toksik ?? • Gejala klinis • Perubahan behaviour • Perubahan eksternal • Perubahan internal • Data kualitas air

  10. Perlu dilakukan analisa di laboratorium untuk memastikan penyebab penyakit. Apa yang bisa dilakukan ??? • Polymerase Chain Reaction (PCR) • Deteksi antigen viral dengan uji serologis • Pengamatan partikel virus dengan mikroskop elektron • Isolasi dan identifikasi virus • Deteksi antibodi dengan uji serologis

  11. Uji serologis yang digunakan : • Agar Gel Precipitation Test (AGPT) • Aglutinasi • Imunofluoresensi • Imunoperoksidase • ELISA • Netralisasi

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