This data note describes the linking of records of the Avon Community-Acquired Pneumonia (AvonCAP) Surveillance Study – A Pan-pandemic Acute Lower Respiratory Tract Disease Surveillance Study (ISRCTN: 17354061), with the participants of the Avon Longitudinal Study of Parents and Children (ALSPAC – also known as ‘Children of the 90s’). These records were obtained from a database created specifically by AvonCAP operating within the two acute care NHS Trusts in Bristol, which is the centre of the ALSPAC study catchment area. These two trusts are the (a) North Bristol NHS Trust (NBT) based at Southmead Hospital (SMH) and (b) the University Hospitals Bristol and Weston NHS Foundation Trust (UHBWT) based at Bristol Royal Infirmary (BRI). The AvonCAP database was updated by staff using a combination of clinical records and self-reporting by the participant, which was unable to be independently verified. Data was collected using the REDCap (Research Electronic Data Capture) software program. Software code was created to transform the original files into a single data base which was reviewed for data-completeness and for its potential value as a research resource. The AvonCAP records provide a contemporaneous record of a subset of the ALSPAC cohort who experienced Lower Respiratory Tract Disease. It is available for research and may be used in conjunction with other ALSPAC data.