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Table 4 Occurrence and prevalence of class 2, 3, and 4 integrons in Gram-positive and Gram-negative bacteria

From: Resistance integrons: class 1, 2 and 3 integrons

Bacterial Occurrence of integrons and the array of gene cassettes Sampling Reference
Class 2 integrons
 Escherichia coli 7.4 % (31/417); dfrA1-sat2-aadA1 (77.4 %, 24/31), estX-sat2-aadA1 (19.4 %, 6/31) and estX-sat2-aadA1 (3.2 %, 1/31) BfT-GermVet monitoring study, Germany, 2004–2006 [67]
 Enterobacteriaceae 34.9 % (52/149); II2 (Tn7), III2 (estX-sat2-aadA1-orfX, most widely distributed) and IV2 (aadA1, first reported) E. coli amd K. pneumoniae strains from swine and chickens, Portugal [62]
 E.coli 3.0 % (3/100) Spain [65]
 E. coli 3.6 % (4/111); dfrA1-sat1-aadA1 Preliminary study, Guangzhou, China [68]
 E. coli One out of 322 Irrigation water and associated sediments, El Paso, Presidio and Weslaco [69]
 Coliforms 2.7 % (5/183) Rivers in northern region of Turkey [63]
 Pseudomona aeruginosa 19.5 % (23/118); dfrA1-sat1-aadA1, first report of class 2 integron in this species of bacteria Preliminary study, Guangzhou, China [19]
 Shigella flexneri 100 % (58/58); dfrA1-sat1-aadA1 Stool samples of sporadic diarrheic patients, China, 2005–2006 [70]
 S. sonneii 93 % (2/43) Adult patients with diarrhoea, Senegal [71]
 S. enterica 85 contemporary multi-drug resistant D-Tartrate-Positive isolates; dfrA1-sat1-aadA1 S. enterica Serovar Paratyphi B isolates Germany, 1995–2001 [72]
 S. enteritidis 4.3 %; estX-sat2-aadA1 Poultry samples, Japan [33]
 E. faecalis Two strains harboring Class 1 and 2 integrons; dfrA1-sat1-aadA1, first evidence of class 2 integron in G+ bacteria Preliminary study, Guangzhou, China [52]
Class 3 integrons
 E.coli   Australia [73]
 E.coli ges1/oxa10:aac(6′) Switzerland [74]
 Serratia marcescens imp1/aacA4 Japan [75]
 Klebsiella pneumoniae ges1/oxa10:aacA4 The urine of an intensive care unit patient in Portugal [76]
Class 4 integrons
 Vibrio cholerae   Collection de I’Institut Pasteur (CIP) [77, 78]
 V. metschnikovii    [77]