BACILLUS OF FRIEDLANDER AND OTHER MEMBERS OF THE CAPSULE-FORMING GROUP.
The bacillus of Friedlander, or Bacillus pneumoniæ, is the type of a rather large group of bacteria, called the Friedlander group, or the group of Bacillus mucosus cap-sulatus. In addition to the ability to produce a mucus-like capsule or envelope, they have in general the following characteristics (Abel): short, plump rods, varying in their proportions, having no motion, no flagellæ, no spore formation, and not staining by Gram's method. They form mucus-like masses in cultures, do not liquefy gelatin and are facultative anaërobes. They are widely distributed in nature, vary from innocuousness to extreme pathogenicity for animals, are rarely found in the mouth, nose and bronchi normally (bacillus of Friedlander), one type being a normal inhabitant of the intestines, especially in children (B. aërogenes capsulatus). In man three members of the group—they may be the same organism or variations
IMMUNITY.CHAPTER XXXIV. JAMA. 1905;XLV(23):1733–1735. doi:10.1001/jama.1905.52510230033002
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