Expression of ESBL, MBL and AmpC B lactamases by extra intestinal Escherichia coli isolates: correlation with treatment and clinical outcome

Abstract

Objective: We investigated the expression of Extended Spectrum β-Lactamases (ESBLs), AmpC β lactamases and Carbapenemases in extraintestinal pathogenic Escherichia coli (ExPEC) isolates and correlated with treatment and outcome of the patients. Methods: Three hundred ExPEC infected patients were included in the study. Demographic data, antibiogram, treatment and outcome were collected. Production of ESBLs was detected by combination disk method; AmpC was detected by AmpC disk test. Carbapenemase production was detected by disk diffusion and confirmed by modified Hodge test. Identification of metallo- β-lactamase (MBL) activity was performed by the carbapenem-EDTA combined disk method and MBL E-test. Results: Out of 300 E. coli isolates, 212 (71%) were ESBL producers. AmpC β lactamase production was seen in 95 (32%) isolates; 16 (17%) isolates were pure AmpC producers whereas 79 (83%) were ESBL co-producers. Twenty nine (9.5%) isolates were carbapenemase producers of which 15 (5%) were MBL producers. For treatment, most widely prescribed antibiotics were β-lactam+β-lactamase inhibitor combinations (39%). Sixty seven percent patients improved; relapse/re-infection was seen in 18% of patients and 11% patients expired. Increased mortality was seen in patients with blood stream infection and more number of relapses was seen in urinary tract infection. Conclusion: ExPEC producing ESBL or AmpC along with carbapenemases are particularly challenging for clinicians and are a major threat worldwide. Early use of appropriate antibiotics like β-lactam+β-lactamase inhibitor combinations will probably reduce complications in these patients.

Keywords

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Expression of ESBL, MBL and AmpC B lactamases by extra intestinal Escherichia coli isolates: correlation with treatment and clinical outcome

Öz

Amaç: Ekstra intestinal patojenik Escherichia coli (EİPEC) izolatlarından salınan GSBL, AmpC β laktamazlar ve Karbapenemazların salınımını ve bu hastaların tedavisi ve klinik gidişle ilişkisini araştırdık.Yöntemler: Çalışmaya 300 EİPEC ile enfekte hasta alındı. Demografik veriler, antibiyogram, tedavisi ve sonuçları toplandı. GSBL üretimi kombine disk metodu ve AmpC üretimi AmpC-disk testi ile tespit edildi. Karbapenemaz salınımına modifiye Hodge testi ile doğrulanmış disk diffüzyonla bakıldı. Metallo-β-laktamaz (MBL) aktivitesi karbapenem-EDTA kombine disk metodu ve MBL E-test ile çalışıldı. Bulgular: Üç yüz E. coli izolatının 212’si (% 71) GSBL pozitif idi. AmpC β laktamaz üretimi 95 (% 32) görüldü; izolatların 16’sı (% 17) saf AmpC üretirken, 79’u (% 83) GSBL ile beraberdi. Karbapenemaz üreten yirmi dokuz (% 9,5) izolatın 15’i (% 5) MBL üretiyordu. Tedavi için, en yaygın olarak reçete edilen antibiyotikler β-laktam + β-laktamaz inhibitör kombinasyonları (% 39) idi. Hastaların % 67’i iyileşti; nüks/yeni enfeksiyon hastaların % 18’inde görülürken % 11 hasta da öldü. Kan dolaşımı enfeksiyonu olan ve sık nüks eden idrar yolu enfeksiyonlarında mortalite daha yüksekti.Sonuç: Karbepenamazlarla birlikte GSBL veya AMPC üreten EİPEC özellikle klinisyenler için dünya çapında büyük bir tehdit oluşturmaktadır β laktam + β laktamaz inhibitör kombinasyonu gibi uygun antibiyotiklerin erken kullanımı muhtemelen bu hastalarda komplikasyonları azaltacaktır

Anahtar Kelimeler

• AmpC, EİPEC, GSBL, MBL

Kaynakça

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