Patients and study design
We analyzed samples from prospectively enrolled CAP patients at Haukeland University Hospital, a tertiary care referral center in Bergen, Norway. The patients had been included in a randomized controlled trial (RCT) (CAPNOR, NCT04660084) or a following observational study on ED patients with suspected CAP, between October 1, 2020, and September 19, 2022. The criteria for eligibility were the same in both cohorts (