S-497 Comparison of reported relative risks for health care, transport, and food processing workers

BackgroundRisk of SARS-CV-2 infection has been strongly linked to occupation, with specific occupational sectors such as health care, food production, and transport, particularly affected. To better understand the potential risks by occupational sector we investigated the reported risks of COVID-19 infection and mortality for employees in the three sectors.MethodsWe performed a rapid review of observational studies reporting COVID-19 risk for employees in health care, food manufacturing, and transport sectors. All studies published in the peer-review and pre-print literature between March 2020 and June 2021 were considered. The primary outcome measure was COVID-19 infection, with COVID-19 related mortality and hospitalisation considered as secondary measures. We extracted odds ratios/relative risks (and standard errors) comparing workers in each sector to within study reference category. To avoid complications due to study heterogeneity, we simply produced descriptive forest plots where possible utilising the odds ratios that have been adjusted for demographics.ResultsEight studies were identified from Norway (one), and California (one), and the UK (five). Three studies at time of writing were peer reviewed, and five of the eight were cohort studies. Food production was the least well investigated with limited evidence of increased infection, severe infection or mortality compared to the ‘other’ groups. Healthcare and transport show wide variation in the odds ratios reported. Public facing roles did indicate greater infection risk, specifically in the first wave. ConclusionsConsiderable study heterogeneity is present, particularly with respect to the chosen reference groups, meaning objective comparisons are limited here. However, as would be expected public facing roles, especially in the first wave, did appear to experience increased infection. Further prospective work with subject level data is needed to better understand the occupational risks.