RAPIDEC®CARBA NP-, CHROMID®CARBA agar- and MHT-based investigation of Carbapenem Resistance-Gram Negative (CRGN) bacteria isolated from wastewater in Basra city


Background: Carbapenem are a wide range of β-lactam antibiotics exploited as a final resort in the controlling of multidrug-resistant bacterial infections. Carbapenemase producing Gram negative bacteria may reach the wastewater via effluent of untreated hospital wastewater in addition to vital role of drug manufacturing companies that loaded their wastewater with such antibiotics leading to emergence of carbapenem resistance bacteria. The current study aims to investigate the carbapenemase producing Gram negative bacteria among wastewater using three different phenotypic methods. Methodology: During a winter period of 2018, 852 wastewater samples were collected from Basra city and cultured on MacConky agar and then confirm identification by API-20E. The Kirby-Bauer were used for screenings of carbapenem resistance and then the carbapenemase producing confirmed by three different phenotypic methods: MHT, RAPIDEC®.CARBA NP and CHROMID®.CARBA agar. Results: The results of bacterial isolation revealed positive culture for 742 (87.08%) of samples while 110 (12.92%) give no growth. Gram negative bacteria were recovered from 514/852 (60.32%) of samples and 228/852(26.76%) for Gram-positive bacteria. All 514 gram negative isolates were submitted for carbapenem producing using disc diffusion method for imipenem, meropenem and ertapenem. The results showed that only 38/514 (7.39%) of Gram negative isolates were resist at least one of the three used carbapenem antibiotics. 10/38 (26.31%) of Gram negative isolates were resist to meropenem, imipenem and ertapenem. 21/38 (55.26%) were resist to meropenem and imipenem while all isolates 38/38 (100%) were resist to meropenem. The 38 isolates of carbapenem producing Gram negative (CRGN) were 20/38 (52.631%) for E. coli, 11/38 (28.947%) for K. pneumoniae, 5/38 (13.157%) for P. aeruginosa and 2/38 (5.263%) for P. mirabilis. The results of three phenotypic assay to investigate the carbapenemase production showed that RAPIDEC®CARBA NP reveal 36/38 (94.74%), MHT reveal 31/38 (81.58%) and CHROMID®CARBA agar reveal 27/38 (71.05%) of isolates were carbapenemase producer. Conclusion: It is easily to conclude that, the carbapenemase producing Gram negative (CPGN) bacteria may reach the wastewater from hospital effluent and drug manufacturers. RAPIDEC®CARBA NP was rapid, accurate and suitable assay for detecting CPGN bacteria.


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