The Archivist has never liked the term ‘chest infection’ or even ‘lower respiratory tract infection’ (LRTI); these terms seem vague. Little P et al [Lancet 2021; 398: 1417–26. https://doi.org/10.1016/S0140-6736(21)01431-8] have recruited children, aged 6 months to 12 years presenting in primary care with acute uncomplicated LRTI, judged to be infective in origin, where pneumonia was not suspected clinically, with symptoms for less than 21 days. This well-established primary care research group have defined LRTI as having an acute cough as the predominant symptom and with other symptoms or signs localising to the lower respiratory tract …