. Fig. 22. Anthrax bacteria in a cover-glass preparation of blood sho-u'ing chains and capsules. dissolution of this membrane. They stain readily with the aniline dyes and also b}^ Gram's method. The bacterium of anthrax itself is not an especially hardy organism. On the contrary it is easily destroyed by weak disinfectants and it has a low thermal death point. Its spores, however, are among the most hardy of bacterial life to resist chemical and thermal agents. They resist drying for months or years and often boiling for a half-hour or longer does not destroy them. On this account it is very
. Fig. 22. Anthrax bacteria in a cover-glass preparation of blood sho-u'ing chains and capsules. dissolution of this membrane. They stain readily with the aniline dyes and also b}^ Gram's method. The bacterium of anthrax itself is not an especially hardy organism. On the contrary it is easily destroyed by weak disinfectants and it has a low thermal death point. Its spores, however, are among the most hardy of bacterial life to resist chemical and thermal agents. They resist drying for months or years and often boiling for a half-hour or longer does not destroy them. On this account it is very difiicult to eliminate the virus from infected pasture lands, especially if they are wet or marshy. As the spores may remain on the soil in a dormant condi- tion for many years, it sometimes happens that the disease does not appear until long after the introduction of the virus. Anthrax has been known to break out among cattle grazing on a field in which the carcasses or hides from affected animals were buried many years before. Through some means the spores seem to be able to get to the surface and contaminate the grass. The virus may be introduced with blood or bone
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