GPs' accounts of their experiences of CRP point-of-care testing for LRTI in this trial have been reported elsewhere (Cals JWL, Chappin FHF, Hopstaken RM, van Leeuwen ME, Hood K, Butler CC, Dinant GJ: C-reactive protein point of care testing for lower respiratory tract infections; a qualitative evaluation of experiences in general practice, submitted). Here, CRP is linked to Recurrent lower respiratory tract infections.