Related Experiment Video
Updated: Aug 15, 2026
Microscopy-based Assays for High-throughput Screening of Host Factors Involved in Brucella Infection of Hela Cells
Published on: August 5, 2016
[The effect of the in-vitro interaction of antibacterial preparations on Brucella melitensis]
Abstract:
The character of drug interaction in 18 various combinations of sisomicin, amikacin, gentamicin, cefotaxime, doxycycline, trimethoprim and nitroxaline was studied by the chess board method with respect to 25 strains of Brucella melitensis. The synergistic effect with respect to the majority of the cultures was observed with the use of the combinations of gentamicin, amikacin or sisomicin with doxycycline. The combinations of the aminoglycosides with cefotaxime and sisomicin or gentamicin with rifampicin had a summation effect on the majority of the cultures. With the use of the combinations of cefotaxime with nitroxaline or trimethoprim and rifampicin with nitroxaline the effect on the majority of the cultures was indifferent. The effect was mainly antagonistic with the use of the combinations of amikacin with rifampicin, gentamicin with trimethoprim and cefotaxime with doxycycline. The effect of the combinations of gentamicin with nitroxaline and cefotaxime with rifampicin was different with respect to different strains of B. melitensis. It was indifferent, antagonistic or summation depending on the strain.
Insights
The study investigated 18 drug combinations against Brucella melitensis, finding synergistic effects with aminoglycosides like gentamicin and doxycycline. Some combinations showed summation or antagonism, with variable effects depending on the bacterial strain.
Area of Science:
- Microbiology
- Pharmacology
- Infectious Diseases
Context:
- Brucella melitensis poses a significant threat to public health.
- Effective antimicrobial chemotherapy for brucellosis requires understanding drug interactions.
- Aminoglycosides, doxycycline, cefotaxime, trimethoprim, nitroxaline, and rifampicin are key antimicrobial agents.
Purpose:
- To evaluate the in vitro activity of 18 drug combinations against Brucella melitensis.
- To identify synergistic, additive, antagonistic, or indifferent drug interactions.
- To guide the selection of effective antimicrobial therapies for brucellosis.
Summary:
- The chessboard method was used to assess 18 combinations of sisomicin, amikacin, gentamicin, cefotaxime, doxycycline, trimethoprim, and nitroxaline against 25 Brucella melitensis strains.
- Synergistic effects were most common with aminoglycosides (gentamicin, amikacin, sisomicin) combined with doxycycline.
- Other combinations exhibited summation, indifference, or antagonism, with some showing strain-dependent variable effects.
Impact:
- Findings highlight the potential of combining aminoglycosides with doxycycline for enhanced Brucella melitensis treatment.
- Understanding drug interactions is crucial for optimizing antibiotic regimens and combating antimicrobial resistance.
- This research provides valuable data for developing more effective therapeutic strategies against brucellosis.
