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Table 2 Number of OSVS records where treatment efficacy or failure was reported by the number of antimicrobials used for treatment (July 1, 2007 – June 30, 2009)

From: Describing antimicrobial use and reported treatment efficacy in Ontario swine using the Ontario swine veterinary-based Surveillance program

Number of antimicrobials used

1

2

3

4

Total

Treatment failure

360

86

26

1

473

Efficacious treatment

175

26

2

0

203

Total

535

112

28

1