Michel J, Bornstein H, Luboshitzky R, Sacks T
Antimicrob Agents Chemother. 1975 Jun;7(6):845-9. doi: 10.1128/AAC.7.6.845.
A synergistic in vitro bactericidal effect of combinations of chloramphenicol and beta-lactams on strains of Enterobacteriaceae is described. The synergism is seen with strains which are resistant to the beta-lactam and is due to chloramphenicol-induced inhibition of beta-lactamase production.