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. 2021 Feb 8;136:104754. doi: 10.1016/j.jcv.2021.104754

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Fig. 3 — Seasonal peak.

The fraction of samples per calender month being positive for (A) 229E, (B) NL63, (C) OC43, and (D) HKU1. The gray line shows the fraction of samples being positive for any of the CoV. Dashed lines mark 95 % confidence interval.

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