The gram-negative bacillus associated with abscesses from cat bites or scratches is

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Bartonella henselae is the gram-negative bacillus commonly associated with abscesses from cat bites or scratches. It is transmitted through the saliva of infected cats and can cause fever, swollen lymph nodes, and abscesses at the site of the bite or scratch. Salmonella typhimurium, Yersinia enterocolitica, Brucella suis, and Francisella tularensis are not typically associated with cat bites or scratches.

The Gram-Negative Bacillus Associated with Abscesses from Cat Bites or Scratches