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Anales de la Facultad de Ciencias Médicas (Asunción)

versión impresa ISSN 1816-8949


SANTA CRUZ, Francisco Vicente et al. In vitro sensitivity of Escherichia coli to fosfomicyn in urine cultures in a private healthcare service in Asunción. An. Fac. Cienc. Méd. (Asunción) [online]. 2021, vol.54, n.2, pp.61-70. ISSN 1816-8949.

Fosfomycin is a natural antibiotic, which acts on the synthesis of the cell wall, with broad spectrum bactericidal activity.

In this study, the in vitro sensitivity of Escherichia coli (E. coli) isolates was evaluated, including those that produce Extended Spectrum Beta Lactamase (ESBL) obtained from urine cultures taken at different data collection times, in people of both sexes. Were included 260 urine samples with development of E. coli from patients who attended the San Roque laboratory. Bacterian isolation and identification was carried out according to conventional methods and antimicrobial sensitivity by the disk diffusion method. For detection of sensitivity to fosfomycin, 200 µg discs were used with the addition of 50 µg of glucose 6-phosphate.

A greater sensitivity for fosfomycin (98.5%) and nitrofurantoin (97.7%) was observed against the evaluated antibiotics. Ciprofloxacin, trimethoprim and the sulfamethoxazole / trimethoprim combination exhibited in front of the same isolated lower sensitivity and very similar among them, with 64.2%, 61.2% and 61.2% respectively. In 44 (16.9%) of the E. coli isolates the presence of ESBL was detected and the high sensitivity shown by fosfomycin and nitrofurantoin is noteworthy, even compared to the positive ESBL isolates, with frequencies of 90.9% and 93,2%, respectively.

In summary, the high sensitivity demonstrated in the present study by E. coli to fosfomycin opens the possibility of considering this first-choice antibiotic in lower urinary infections, even in ESBL-producing germs, in the population of our country.

Palabras clave : fosfomycin; Escherichia coli; ESBL; urine..

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