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

Table 2 proportional selection rules for DUTY follow-up

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%

ISSN: 1471-2334