Impact of the COVID‐19 pandemic on study protocol
ARI
VIRUS, RECRUITMENT, APPENDIX, INFLUENZA
In response to SARS‐CoV‐2 community transmission in WA, study Year 1's intervention was paused on 4/1/2020. Study Year 2 recommenced on 11/2/20 but was terminated early on 4/1/2021 due to operational futility based on minimal influenza activity in King County, WA. During the second year of the study, 5 of the 9 shelters relocated their residents to new facilities to enable improved adherence to SARS‐CoV‐2 transmission mitigation measures (Table Concurrent study recruitment of shelter residents that did not fit ARI criteria to improve SARS‐CoV‐2 surveillance sensitivity was initiated on 4/1/2020. For protocol details and data on non‐ARI influenza virus detection, see Appendix 