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Anales de la Facultad de Ciencias Médicas (Asunción)

versão impressa ISSN 1816-8949


VELAZQUEZ, Gladys Raquel et al. Identification of enzyme resistance mechanisms in pathogens from an outpatient clinic in a public hospital in San Lorenzo, Paraguay; 2015-2019. An. Fac. Cienc. Méd. (Asunción) [online]. 2020, vol.53, n.2, pp.25-36. ISSN 1816-8949.


The objective of this study was to assess frequency of enzymatic resistance mechanisms isolated from community urinary tract infections (UTI) determined in vitro in urine cultures.


This is a retrospective study, a total of 1031 urine samples were included from patients with urinary tract infection who had consulted at the Outpatient Clinic and Emergencies Services. The following information was recorded, age, sex, urine sample. All urine cultures in which pathogens with a count of ≥ 105 CFU / mL were included. Were excluded polymicrobial urine cultures, those without an antibiogram or those with incomplete clinical data.


A total of 1031 urine samples met inclusion criteria, 56% of patients were female and 43% male. The mean age of the women was 52 ± 20 years and in men was 62 ± 16 years. 553 (52%) E. coli and 148 (14%) Klebsiella strains were isolated from community samples. Male urine cultures: The main resistance mechanism of Escherichia coli was ESBLs, 55 isolates (91%); followed by MBL, 3 isolates (5%) and KPC, 2 isolates (3%). In Klebsiella pneumoniae (53 isolates); ESBL, 31 isolates (58%); followed by KPC 13 isolates (25%) and MBL, 9 isolates in (16%). Female urine culture: Escherichia coli enzymes 81 isolates, of which ESBLs were 79 isolates (97%); followed by KPC, 1 isolate (1%) and MBL, 1 isolate (1%). In Klebsiella pneumoniae the following enzymatic mechanisms could be observed based on 35 isolates; ESBL, 19 isolates (54%), followed by KPCs, 12 isolates (34%) and finally, MBL, 4 isolates (13%).


The result of our study showed high prevalence of Escherichia coli and Klebsiella pneumoniae causing resistance to antibiotics in culture bacteria from urine samples of patients with UTI, and ESBL was the main β-lactamase resistance mechanism in Klebsiella and E. coli isolates in both male and female.

Palavras-chave : antimicrobial resistance; ESBL; carbapenemases; MBL; urinary tract infection (UTI); KPC..

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