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2015 ; 59
(3
): 1466-71
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In Vitro activities of combinations of rifampin with other antimicrobials against
multidrug-resistant Acinetobacter baumannii
#MMPMID25534730
Bai Y
; Liu B
; Wang T
; Cai Y
; Liang B
; Wang R
; Liu Y
; Wang J
Antimicrob Agents Chemother
2015[Mar]; 59
(3
): 1466-71
PMID25534730
show ga
The antimicrobial treatment of multidrug-resistant (MDR) Acinetobacter baumannii
infections has become a great challenge for medical staff all over the world.
Increasing numbers of MDR A. baumannii infections have been identified and
reported, but effective clinical treatments for them are decreasing. The
objective of this study was to investigate the in vitro activities of
combinations of rifampin (an established antimicrobial) and other antimicrobials,
including biapenem, colistin, and tigecycline, against 73 clinical isolates of
MDR A. baumannii. In total, 73 clinical isolates of MDR A. baumannii were
collected from two A-level general hospitals in Beijing, and the MICs of
rifampin, biapenem, colistin, and tigecycline were determined. The checkerboard
method was used to determine the fractional inhibitory concentration indices
(FICIs), that is, whether the combinations acted synergistically against these
isolates. The MIC50, MIC90, and MICrange of rifampin combined with biapenem,
colistin, and tigecycline against the isolates were clearly lower than those for
four antimicrobials (rifampin, biapenem, colistin, and tigecycline) that were
used alone. Combinations of rifampin with biapenem, colistin, and tigecycline
individually demonstrated the following interactions: synergistic interactions
(FICI ? 0.5) for 31.51%, 34.25%, and 31.51% of the isolates, partially
synergistic interactions (0.5 < FICI < 1) for 49.31%, 43.83%, and 47.94% of the
isolates, and additive interactions (FICI = 1) for 19.18%, 21.92%, and 20.55% of
the isolates, respectively. There were no indifferent (1 < FICI < 4) or
antagonistic (FICI ? 4) interactions. Therefore, combinations of rifampin with
biapenem, colistin, or tigecycline may be future therapeutic alternatives for the
treatment of MDR A. baumannii infections.