Archive image from page 301 of The pathology and differential diagnosis The pathology and differential diagnosis of infectious diseases of animals differentpathology00moorrich Year: 1908 278 BLACK LEG a number of the other Western States are badly infected. Many of the states east of the Mississippi river have infected localities, but in a few of the Eastern and Southern states it seems not to exist. During the last few years infected locali- ties have been found in New York where there has been an annual loss from this disease, but where prior to recent inves- tigations the cause of death h
Archive image from page 301 of The pathology and differential diagnosis The pathology and differential diagnosis of infectious diseases of animals differentpathology00moorrich Year: 1908 278 BLACK LEG a number of the other Western States are badly infected. Many of the states east of the Mississippi river have infected localities, but in a few of the Eastern and Southern states it seems not to exist. During the last few years infected locali- ties have been found in New York where there has been an annual loss from this disease, but where prior to recent inves- tigations the cause of death has been attributed to poisoning. § 20I. Etiology. Black leg is caused by Bacillus chau- veaui. This organism varies from 3 to 6yw in length and from to ; in width. The ends are rounded and it produces spores. It stains readily with ordinary aniline dyes and also after the gram method. In cultures long involution forms are often observed. It is anaerobic. In suitable culture media under anaerobic conditions or in animal tissues (other than \ \ \ 1 \ ' o ' .\ Fig. 63. Bacillus of black leg ivith flagella and ivith spores {after Hutyra). blood) it multiplies rapidly with the evolution of gas. The presence of spores renders it very resistant to natural destruc- tive agencies and to the common disinfectants. The bacillus of black leg or its spores are supposed to gain entrance to the tissues of animals through abrasions of the skin or, possibly, the raucous membranes of the mouth or intestine. The period of incubation is not known in cattle but it is supposed to be very short. Guinea pigs inoculated with a culture of the organism die in from one to three days.
Size: 1419px × 1410px
Photo credit: © Bookend / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
