Koch's postulates Diseased althy ani animal Postulate 1 The suspected pathogenic Observe organism should be present Red bloodtissue in all cases of the disease blood under the and absent from healthy cell mIcroscope animals Suspe Red blood cell patho
Koch’s postulates
Kochs postulates organisms present Postulate 2 Streak agar plate with sample The suspected organism from either should be grown in pure diseased or culture healthy animal Colonies of suspected pathogen Inoculate healthy animal with cells uspected pathogen
Koch’s postulates
Koch's postulates Inoculate healthy animal with cells suspected path stulate 3 Cells from a pure culture of the suspected organism should cause disease in a healthy animal Diseased Remove blood or tissue sample and observe by microscopy Postulate 4 The organism should be Laboratory culture reisolated and shown to be the same as the Suspected pathoger Pure culture (must be same orgi as before)
Koch’s postulates
Discovery of viruses to bacco mosaic virus tulips breaking virus 1619 (a morbid beauty
Discovery of Viruses tulips breaking virus 1619 (a morbid beauty) tobacco mosaic virus
Discovery of viruses o the very first virus discovered is credited to the St Petersburg academy of Science on the 12th February 1892 by dmitri I wanowsky a russian botanist while studying mosiac tobacco disease, he r found that the agent causing the disease was small enough for pass though ceramic filter that are small enough to trap all bacteria this is generally accepted as the beginning of virology MBaHOBCKWn (1864-1920)
Discovery of Viruses The very first virus discovered is credited to the St. Petersburg Academy of Science on the 12th February 1892 by Dmitri Iwanowsky a Russian botanist. While studying mosiac tobacco disease, he found that the agent causing the disease was small enough for pass though ceramic filter that are small enough to trap all bacteria. This is generally accepted as the beginning of Virology. Ивановсқий (1864-1920)