Fig. 5: Results of linear regression models with N-gene Ct values as the outcome variable and symptoms as individual predictors, adjusted for age, sex and, where appropriate, vaccination status, among Nā=ā10,709 swab-positive respondents in rounds 17ā19 (5 January to 31 March 2022).
From: Variant-specific symptoms of COVID-19 in a study of 1,542,510 adults in England

Error bars show 95% confidence intervals. Fever, chills, and sore throat are the symptoms with the strongest negative association with Ct value, each associated with approximately a tenfold increase in viral load.