Contagious Abortion of Cows

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Author: Ward J. MacNeal
Published: 1911
Language: English
Wordcount: 6,881 / 28 pg
Flesch-Kincaid Reading Ease: 42.3
Downloads: 334
Added to site: 2011.07.25
mnybks.net#: 30493
Genre: Instructional
Excerpt

of premature delivery, and of these, six appeared clinically to be cases of contagious abortion. Placental tissue from two of these cases was examined by the Nowak plate method and a bacillus isolated, apparently identical with that isolated by Bang in Denmark and by Nowak in Austria.

The organism is a very small short rod, usually oval in shape, from 0.8 mu to 2.0 mu long by 0.7 mu wide, practically always single, rarely in short threads of two to four cells. It is not motile, and does not form spores. It stains with moderate rapidity with the ordinary anilin dyes, and is decolorized by Gram's method. The colonies on serum-agar are raised, with smooth circular borders, appearing almost like drops of dew. They are transparent and very clear, with a bluish gray color by transmitted light. Under the microscope a few coarse granules may be seen near the center of the colony but the greater part of it appears very homogenous and almost water-clear. The appearance of the colony is really a very characterist

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