Synergistic efficacy of meropenem, ciprofloxacin and colistin antibiotics against planktonic and biofilm forms of Myroides odoratimimus bacterial isolates

•A zone of inhibition was not observed against other antibiotics used except amikacin and linezolid in all strains.•While CT/MEM and CT/CIP combinations have a synergistic effect on all strains, CIP/MEM has an additive effect.•According to the biofilm inhibition results, the efficacy of MEM (60.3–76.5%) and CIP (60.2–77.8%) was almost two times higher than that of CT (25.4–34.5%).•Biofilm inhibition of CT alone was 30.8%, whereas CT/MEM and CT/CIP were 92.4% and 91.7%, respectively. MEM/CIP inhibited biofilm formation by 75.7%.