S41 Incidence of SARS-CoV-2 and non-SARS-CoV-2-associated community acquired lower respiratory tract infections in Bristol, UK: a prospective cohort study

S41 Figure 1ConclusionsWhile SARS-CoV-2 infection was a large component of hospitalised aLRTD, non-SARS-CoV-2 infection caused 56% of respiratory infection hospitalisations overall. Measured incidences of non-SARS-CoV-2 pneumonia and NP-LRTI were higher than pre-pandemic UK estimates. Given public health interventions to reduce all infective aLRTD implemented during this year, these higher estimates likely reflect highly comprehensive surveillance although there may have been a true higher non-SARS-CoV-2 disease incidence. These results demonstrate the significant burden of acute respiratory infection on healthcare systems. Broader efforts to prevent and manage all forms of adult aLRTD should be prioritized in addition to current COVID-19 prevention efforts.Please refer to page A209 for declarations of interest related to this .

Acute Lower Respiratory Tract Disease (aLRTD)is a complex clinical syndrome causing significant disease burden in a prospective cohort study

Background: Acute Lower Respiratory Tract Disease (aLRTD) includes pneumonia, non-pneumonic lower respiratory tract infection (NP-LRTI), heart failure (HF) and chronic respiratory disease exacerbation (CRDE). COVID19 has affected aLRTD disease burden. Few studies estimate total aLRTD burden, and subgroup distribution may have changed. Aim(s): To describe the frequency of individual aLRTD components and determine the impact of COVID19 on aLRTD disease. Method(s): A prospective cohort study of all adults >=18y admitted to either acute care hospital in Bristol, UK, from Aug 20-Jul 21. Patients were included if presenting with signs/symptoms or a clinical/radiological diagnosis of aLRTD. Result(s): 9243 aLRTD hospitalisations occurred: 5161 pneumonia, 2636 NP-LRTI, 1990 HF, 4144 CRDE, and 198 undifferentiated aLRTD cases. Overlap was common (Fig1): 31% HF and 83% CRDE events occurred in association with pneumonia or NP-LRTI. Hospitalisation rates corresponded with COVID-19 incidence over time. 41% hospitalisations were associated with positive SARS-CoV-2 test. Non-COVID19 aLRTD hospitalisations showed less variation over time. Discussion(s): aLRTD is a complex matrix with significant overlap between CRDE, HF and pneumonia/NP-LRTI. COVID19 disease in hospitalised adults was a large component of total aLRTD during this pandemic year;however, non-COVID19 aLRTD caused considerable disease burden.