Table 1. Biofilm formation capacity of tested bacteria (crystal violet assay).
Bacteria | Strain characteristics | Optical density A570 nm, units | P* | Biofilm formation capacity | |
---|---|---|---|---|---|
Control | 1 day biofilm | ||||
E. coli ATCC 25922 | Antibiotic sensitive | 0.1 ± 0.002 | 0.7 ± 0.05 | <0.001 | High |
E. coli NCTC 13353 | Beta-lactamase producing | 0.1 ± 0.004 | 0.1 ± 0.03 | 0.17 | Low |
S. aureus 203 | Antibiotic sensitive | 0.1 ± 0.002 | 1.1 ± 0.08 | <0.001 | High |
S. aureus 73.1 | Azitromycin resistant | 0.1 ± 0.01 | 0.3 ± 0.03 | 0.03 | Intermediate |
A. baumannii 28 | Antibiotic multiresistant | 0.1 ± 0.002 | 0.6 ± 0.04 | <0.001 | High |
A. baumannii 143 | Antibiotic multiresistant | 0.1 ± 0.01 | 0.26 ± 0.03 | 0.02 | Intermediate |
A. baumannii 149.2 | Antibiotic multiresistant | 0.1 ± 0.01 | 0.8 ± 0.09 | 0.002 | High |
*P–statistical significance of differences in optical density compared to control wells without added bacteria. Each test consisted of 3 independent measurements.