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Distribution of MICs of penicillin (a), tetracycline (b), ciprofloxacin (c), cefuroxime (d), spectinomycin (e), and ceftriaxone (f) for N. gonorrhoeae isolates. Symbols: 
, susceptible; 
, moderately susceptible or strains with reduced susceptibility; ▧, resistant. The breakpoint criteria used for assessing the susceptibility were those recommended previously (21, 22).
