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. 2021 Jul 17;34(12):1867–1877. doi: 10.1111/jeb.13896

FIGURE 2.

FIGURE 2

Semi‐quantitative clinical, epidemiological and diagnostic individual history of COVID‐19 infections. The clinical timeline shows the distribution function of the incubation period (time from infection to onset of symptoms), the vertical bar representing the median (McAloon et al., 2020). The breakdowns into clinical phases are exposed are presented with respect to the median symptom onset date (Bouadma et al., 2020; Nalbandian et al., 2021; Polak et al., 2020). The asymptomatic fraction on the top is that estimated by Byambasuren et al. (2020). The epidemiological timeline represents the probability density of the generation time estimated by Ferretti et al. (2020), with the vertical bar showing the median. The latency is the time between infection and the onset of contagiousness. The diagnosis timeline indicates the positivity kinetics of nasopharyngeal RT‐qPCR tests. Following the estimates from Hellewell et al. (2021), more than 50% of cases are positive in the central green band and more than 5% in the peripheral light green bands. Antigenic and serological (immunoglobulin (Ig) M and G) test positivities are shown for qualitative purposes following the estimates from Mercer and Salit (2021)