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Azithromycin (AZM) susceptibility of P. aeruginosa isolates cultured from sputum was determined using the disc diffusion method. AZM inhibition zones for 3xGly cleaving (RF/min > 5) P. aeruginosa strains was compared to inhibition zones of 3xGly non-cleaving strains (RF/min < 5) using the unpaired, two-tailed students t-test (*** P < 0.0001). A horizontal line indicates the median AZM inhibition zone size.
