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Volume 17, Number 9—September 2011


Ciprofloxacin-Resistant Shigella sonnei among Men Who Have Sex with Men, Canada, 2010

Christiane GaudreauComments to Author , Ruwan Ratnayake, Pierre A. Pilon, Simon Gagnon, Michel Roger, and Simon Lévesque
Author affiliations: Author affiliations: Centre Hospitalier de l’Université de Montréal–Hôpital Saint-Luc, Montreal, Québec, Canada (C. Gaudreau); Université de Montréal, Montreal (C. Gaudreau, P.A. Pilon, S. Gagnon, M. Roger); Agence de la Santé et des Services Sociaux de Montréal-Santé Publique, Montreal (R. Ratnayake, P.A. Pilon); Public Health Agency of Canada, Ottawa, Ontario, Canada (R. Ratnayake); Centre Hospitalier de l’Université de Montréal–Hôpital Notre-Dame, Montreal (S. Gagnon, M. Roger); Laboratoire de Santé Publique du Québec/Institut National de Santé Publique du Québec, Sainte-Anne-de-Bellevue, Quebec (S. Lévesque)

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Table 2

Antimicrobial drug susceptibility of Shigella sonnei isolates to 7 agents, Montreal, Québec, Canada, 2010*

Antimicrobial agent No. isolates tested MIC Interpretation
Ampicillin 11 2–8 mg/L S
TMP/SMX 11 >32 mg/L R
Ciprofloxacin 11 >4–16 mg/L R
Azithromycin 8 8–16 mg/L NA
Cefotaxime 8 0.06–0.125 mg/L S
Tetracycline 7 256–>256 mg/L R
Nalidixic acid 8 6 mm† R

*The susceptibility and resistance breakpoints were those for Enterobacteriaceae, except for azithromycin, for which these breakpoints are not available (7). TMP/SMX, trimethoprim/sulfamethoxazole; S, susceptible; R, resistant; NA, not available.
†By disk diffusion method (7).

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