COVID pode ser mais infecciosa nos 2 ou 3 dias próximos ao início dos sintomas. 2 Set, 2021 | 11:43h COVID may be most infectious 2 or 3 days around symptom onset – CIDRAP Artigo original: COVID-19 Transmission Dynamics Among Close Contacts of Index Patients With COVID-19: A Population-Based Cohort Study in Zhejiang Province, China – JAMA Internal Medicine