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Table 2 proportional selection rules for DUTY follow-up

From: The diagnosis of urinary tract infections in young children (DUTY): protocol for a diagnostic and prospective observational study to derive and validate a clinical algorithm for the diagnosis of UTI in children presenting to primary care with an acute illness

Category Definition Location Proportion to be sampled at Day 14
> 105 CFU/ml Pure or 1 predominant species BOTH NHS lab and Central research lab 100% (All)
>103 and < 105 CFU/ml Pure or 1 predominant species Central research lab 20% in total (combination of both categories)
>105 CFU/ml 2 or more species BOTH NHS lab and Central research lab  
< 103 CFU/ml and ‘No Growth’   BOTH NHS lab and Central research lab 10%