Quotation from: Manual of Surgery

Written by: Alexander Miles and Alexis Thomson


_Bacilli_ are rod-shaped bacteria, usually at least twice as long as
they are broad (Fig. 4). Some multiply by fission, others by
sporulation. Some forms are motile, others are non-motile. Tuberculosis,
tetanus, anthrax, and many other surgical diseases are due to different
forms of bacilli.


_Spirilla_ are long, slender, thread-like cells, more or less spiral or
wavy. Some move by a screw-like contraction of the protoplasm, some by
flagellae. The spirochaete associated with syphilis (Fig. 36) is the most
important member of this group.

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