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#The Soft Sore, Soft Chancre, or Chancroid.# The differential diagnosis of syphilis necessitates the consideration of the soft sore, soft chancre, or chancroid, which is also a common form of venereal disease, and is due to infection with a virulent pus-forming bacillus, first described by Ducrey in 1889. Ducrey's bacillus occurs in the form of minute oval rods measuring about 1.5
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