Transferable chloramphenicol and ampicillin resistance in a strain of Haemophilus influenzae

Antimicrob Agents Chemother. 1978 Jul;14(1):154-6. doi: 10.1128/AAC.14.1.154.


A strain of Haemophilus influenzae isolated from sputum has been shown to be resistant to chloramphenicol, ampicillin, and tetracycline. All three resistances were transferred together to recipients when the selecting antibiotic was ampicillin, chloramphenicol, or tetracycline.

MeSH terms

  • Ampicillin / pharmacology*
  • Chloramphenicol / pharmacology*
  • Haemophilus influenzae / drug effects*
  • Penicillin Resistance
  • Species Specificity


  • Chloramphenicol
  • Ampicillin