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Various virulences of clinical isolates, including colistin-resistant strains. (A) C3H/FeJ mice were infected iv with 5 × 107 HUMC4, -5, -6, and -12 and R2 and C14 bacteria, all of which caused 100% mortality (n = 5 to 8 mice per group). ATCC 17978 and R2 were avirulent. (B) In vitro growth rates did not differ substantially among strains irrespective of virulence in vivo.
