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Timing graph comparing culture and concurrent exotoxin A titer using age-specific serological cutoffs. The median time of positive culture is 3.02 years with 95% CI of 2.04–5.52, the median time of positive exotoxin A titer is 1.02 years with 95% CI of 0.98–2.01years (P=.004 by paired logrank test).
