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Table 2 Source of isolation, distribution and caharacteristics of class 1 integron gene cassettes in E. coli blood culture isolates (strain collections 1 and 2) and in gastrointestinal E. coli isolates (strain collection 3).

From: Prevalence and characterization of integrons in blood culture Enterobacteriaceae and gastrointestinal Escherichia coli in Norway and reporting of a novel class 1 integron-located lincosamide resistance gene

Source and year of isolation1 No. of cassette positive isolates/total no. of tested isolates Size of integron gene cassette (kb) Genes in cassettes2
Strain collection 1 (1998–1999) 20/131   
B 8/36   
  5 0.7 dfrA5
  1 1.0 aadA1
  1 1.6 dfrA17-aadA5
  1 2.0 oxa1-aadA1
O 6/38   
  2 1.0 aadA1
  2 1.6 dfrA17-aadA5
  2 1.6 dfrAI-aadA1
Th 1/33   
  1 0.7 dfrA5
5/24   
  1 0.8 dfrA7
  2 1.0 aadA1
  2 1.6 dfrA17-aadA5
Strain collection 2 (1991–92; 1995–96) 18/53   
M (1991–92) 3/13   
  1 1.0 aadA1
  2 1.6 dfrAI-aadA1
M (1995–96) 8/21   
  1 0.7 dfrA5
  2 1.0 aadA1
  3 1.6 dfrA17-aadA5
  2 1.6 dfrAI-aadA1
R (1991–92) 5/8   
  2 0.7 dfrA5
  1 1.0 aadA1
  1 1.6 dfrAI-aadA1
  1 2.0 oxa1-aadA1
R (1995–96) 2/11   
  1 1.9 aadA2-linF
  1 2.2 dfrB2-aadA1-catB2
Strain collection 3 3 (2000–2001) 23/54   
  12 0.7 dfrA7
  2 0.8 dfrA7
  2 1.0 aadA1
  1 1.6 dfrA17-aadA5
  3 1.6 dfrAI-aadA1
  1 0.15; 1.6 No cassette; dfrA17-aadA5
  2 1.8 dfrA12-aadA2
  1. 1 B: Haukeland University Hospital, Bergen; O: Ullevål University Hospital, Oslo; Th: Trondheim University Hospital, Trondheim; Tø: Tromsø University Hospital, Tromsø; M: Molde County Hospital, Molde; R: Norwegian Radium Hospital, Oslo 2 Accession numbers of respective genes: X12870 (aadA1); X68277(aadA2); AF137361 (aadA5); J02967 (oxa1); X00926 (dfrA1); X12868 (dfrA5); X58425 (dfrA7); Z21672 (dfrA12); AF164091 (dfrA17); J01773 (dfrB2); M80188 (catB2); AJ561197 (linF) 3 Human isolates from the strain collection at the Norwegian reference laboratory for enteropathogenic microbes at the Norwegian Institute of Public Health.