Figure 2.

Timeline for tests and test results for the 36 players testing positive or reactive at any time during study period. Every line represents one player, the boxes on the left (A, B, C, etc.) denote their teams. On the horizontal timeline axis, PRE denotes entry tests, performed at the start of each team’s quarantine period, which are shown as shaded grey areas. POST indicates the final test, completed during the week after the final match of the season. Blue shading illustrates the match phase, with division 1 teams at the top, starting during week 2, and division 2 teams at the bottom, starting during week 3. Green stick figures depict negative PCR tests, orange reactive and red positive, while black and dark grey figures denote positive and reactive tests traced to sources outside football. Green syringes depict negative serology tests and blue positive (not all positive or reactive players had a follow-up serology test by the end of the study period). The horizontal dashed black lines illustrate the individual quarantine period for each player. The red horizontal lines indicate the symptomatic period for players reporting any symptoms.