Table 2.

Class 1 integron incidence and predominance of Gram-positive and Gram-negative microbial species (Deng et al., 2015).

Gram-negative bacterial strain	Class 1 Integron prevalence and the wide range of gene cassettes	Sampling	References
Vibrio cholera	44/176; aadB-aadA2-blaP1-dfrA1-dfrA15	Thailand	Dalsgaard et al. (2000)
Pseudomonas aeruginosa	45.8% (54/118)	Preliminary study in Guangzhou, China	Xu et al. (2009)
Burkholderia	29.4% (5/17); oxa-aac (6′-1a)	Ireland	Crowley et al. (2002)
Campylobacter	62/378	Ireland	Shin et al. (2015)
Escherichia coli	59.5% (355/597)	South Thailand	Vinué et al. (2008)
Escherichia coli		Preliminary study in Guangzhou, China	Xu et al. (2011b)
Serratia	1/30; aacC1-ORFX-ORFY-aadA1	Canada	Crowley et al. (2008)
Salmonella	36.2% (34/94); aadA2-bla (PSE-1) (61.76% 21/34); aadA1-aadA2-bla (PSE-1) (38.23%,13/34)	Animals, Japan	Ahmed et al. (2006)
Stenotrophomonas maltophilia	22% (20/93)	Kaohsiung Medical University	Chang et al. (2004)
Salmonella enteritidis	11.9% (59)	Taiwan	Huang et al. (2013)
Aeromonas	16/41 (39.02%); dfrA15-cmlA4-aadA2	Hidalgo, Mexico	Pérez-Valdespino et al. (2009)
Enterobacteriaceae	50/226	Addenbrooke’s Hospital	Machado et al. (2008)
Escherichia coli	4/32 (12.5%); sat-1-aadA	Meat and meat products, Norway	Sunde (2005)
Klebsiella Pneumoniae	18/26	Bloodstream infections	Xu et al. (2011a)
Shigella	EstX-aadA1 (3.85%, 1/26)	Hiroshima prefecture, Japan; 2000–2004	Ahmed et al. (2006)
Pseudomonas aeruginosa	High prevalence	Iran	Shahcheraghi et al. (2010)