Fig. 2. Comparison of ORs for swab positivity based on presence or absence of any of 26 symptoms surveyed in N = 1,542,510 participants across five variant-phases of REACT-1.

ORs are derived from logistic regression models with swab positive (1/0) as the outcome variable, adjusted for age, sex and vaccination status. Error bars show 95% confidence intervals. ORs are higher for BA.2 than BA.1 for all symptoms. Fever and cough have the highest ORs for BA.2 and BA.1, while loss or change of smell or taste have the highest ORs in all previous variants.