CRP and infection: Strategies whereby testing for CRP as a predictor of clinical outcome rather than determining aetiology have been evaluated in primary care: a cluster-randomised controlled trial in Belgium showed CRP to rule-out serious infection using a 5 mg/L threshold, while a systematic review found CRP testing to be useful in identifying serious infections among febrile children (Verbakel et al., 2016, Van den Bruel et al., 2011).