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Antibiogram signatures of some enterobacteria recovered from irrigationWater and agricultural soil in two district municipalities of South Africa

Iwu, C.D.
du Plessis, E.M.
Korsten, L.
Nontongana, N.
Okoh, A.I.
Abstract
This study was undertaken to evaluate the antibiogram fingerprints of some Enterobacteria recovered from irrigation water and agricultural soil in two District Municipalities of the Eastern Cape Province, South Africa using standard culture-based and molecular methods. The prevalent resistance patterns in the isolates follow the order: Salmonella enterica serovar Typhimurium [tetracycline (92.3%), ampicillin (69.2%)]; Enterobacter cloacae [amoxicillin/clavulanic acid (77.6%), ampicillin (84.5%), cefuroxime (81.0%), nitrofurantoin (81%), and tetracycline (80.3%)]; Klebsiella pneumoniae [amoxicillin/clavulanic acid (80.6%), ampicillin (88.9%), and cefuroxime (61.1%)]; and Klebsiella oxytoca [chloramphenicol (52.4%), amoxicillin/clavulanic acid (61.9%), ampicillin (61.9%), and nitrofurantoin (61.9%)]. Antibiotic resistance genes detected include tetC (86%), sulII (86%), and blaAmpC (29%) in Salmonella enterica serovar Typhimurium., tetA (23%), tetB (23%), tetC (12%), sulI (54%), sulII (54%), catII (71%), blaAmpC (86%), blaTEM (43%), and blaPER (17%) in Enterobacter cloacae., tetA (20%), tetC (20%), tetD (10%), sulI (9%), sulII (18%), FOX (11%) and CIT (11%)-type plasmid-mediated AmpC, blaTEM (11%), and blaSHV (5%) in Klebsiella pneumoniae and blaAmpC (18%) in Klebsiella oxytoca. Our findings document the occurrence of some antibiotic-resistant Enterobacteria in irrigation water and agricultural soil in Amathole and Chris Hani District Municipalities, Eastern Cape Province of South Africa, thus serving as a potential threat to food safety.
Description
Date
2020-08-07
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Publisher
MDPI
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Keywords
Agricultural soil , Antibiotic resistance , Environmental health , Food microbiology , Food safety , Public health , Irrigation water , SDG-03 Good health and well-being
Citation
Iwu CD, du Plessis EM, Korsten L, Nontongana N, Okoh AI. Antibiogram signatures of some enterobacteria recovered from irrigation water and agricultural soil in two district municipalities of South Africa. Microorganisms. 2020 Aug 7;8(8):1206. doi: 10.3390/microorganisms8081206.
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