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. 2016 Jul 13;6:29316. doi: 10.1038/srep29316

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(a) Serum resistance level of isolates from the different capsule types. Responses were graded as follows: grade 5 (highly serum-resistant), viable CFU after 3 hours of incubation in serum > 100% of the inoculum; grade 4 (serum-resistant), 71– 100%; grade 2 (serum-susceptible), 1–30%; grade 1 (highly serum-susceptible), 0%. The negative control, E. coli OP50, was highly-serum susceptible. (b) Comparison of prevalence of serum-resistant (grade 4 or 5) population between K1/K2/K5 isolates and non-K1/K2/K5 isolates (93.7% vs 57.1%; P = 0.019 using Fisher’s exact test).