Bacteriology for nurses / [Isabel McIsaac].

  • Isabel McIsaac
Date:
1914
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Licence: In copyright

Credit: Bacteriology for nurses / [Isabel McIsaac]. Source: Wellcome Collection.

    26/208 page 8
    inch) in length; the largest (pathogenic) bacterium known is the spirillum (screw-shaped) of relapsing fever; the bacillus of influenza is one of the smallest of the pathogenic forms, although there are known to be smaller organisms which are too minute to be seen with the present microscopes; the virus of yellow fever will pass through a porcelain filter ; the germs of pleuro-pneumonia and foot-and-mouth disease in cattle are too small to be observed (ultra- microscopic). Shape, — The forms of bacteria are exceedingly simple, comprising three types—the rod, the sphere. \ a a. Single bacilli. Q) ol ooogigxJirwotf ' I'' b. Bacilli in pairs. 23 ' I '' c. Bacilli iu threads. 00 00 0 ^ 8S % a h c d e a. Staphylococci, b. Streptococci, c. Diplococci. d. Tetrads, e. Sarcinaa \ ’ I 2 ^ L Oj . ^ r ) (l ^ c ) s 'V. a ft a. and c. Spirilla in comma forms and longer threads known as spiro- cbaeta. b. Thick spirals sometimes known as vibrios. Fia. 1.
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