Molekularna karakterizacija iz psa izdvojenog izolata bakterije Escherichia coli koji proizvodi prošireni spektrum beta-laktamaza i New Delhi metalo-beta-laktamazu-1 (blaNDM1) - prikaz slučaja

Abstract

In this article, we report the molecular characterization of extensively drug resistant (XDR), extended spectrum, class C beta-lactamases and NDM-1 carbapenemase producing E. coli, isolated from the scrotal fluid of a 3-year-old male dog. In an antibiotic susceptibility test the E. coli isolate was susceptible only to tigecycline and resistant to all clinically applicable antibiotics tested in the study. The minimum inhibitory concentration (MIC) of meropenem, cefotaxime and cefepime was 256, 128 and 64 µg/mL, respectively. On genotypic screening by PCR, the isolate was positive for blaNDM, blaCTX-M, blaAmpC, blaTEM and sul1 genes. The isolate was a ESBL, AmpC and metalo beta-lactamase producer. On molecular pathotyping, the isolate harbored the Shiga toxin producing gene (Stx2). The extensively drug resistant, carbapenem resistant and ESBL producing E. coli constitutes a major public health concern, since there is a great chance of dissemination of resistance genes to humans due to the close association of humans and companion animals. To the best of our knowledge, this is the first report of blaNDM1 isolated from a dog in India.U radu se izvješćuje o molekularnoj karakterizaciji bakterije E. coli izdvojene iz skrotalne tekućine psa, iznimno otporne na antibiotike širokog spektra, koja proizvodi klasu C beta-laktamaza i NDM-1 karbapenemazu. Pas je bio u dobi od od tri godine. Izolat E. coli bio je osjetljiv samo na tigeciklin, a otporan na sve antibiotike primjenjivane u kliničkoj praksi. Minimalna inhibicijska koncentracija (MIC) za meropenem iznosila je 256, cefotaksim 128 i cefepim 64 µg/mL. Pretragom genotipa lančanom reakcijom polimerazom izolat je bio pozitivan na gene blaNDM, blaCTX-M, blaAmpC, blaTEM i sul1. Proizvodio je ESBL, AmpC i metalo-beta-laktamazu. Molekularnom patotipizacijom dokazano je da posjeduje gen za shiga-toksin (Stx2). E. coli otporna na karbapenem, koja proizvodi beta-laktamaze širokog spektra, velika je prijetnja za javno zdravstvo s obzirom na to da postoji velika mogućnost prijenosa E. coli s genom za rezistenciju na ljude u bliskom dodiru s kućnim ljubimcima. Ovo je prvo izvješće o blaNDM1 dokazanom u psa u Indiji