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Symptom check list in English campbellteaching.co.uk/covid19/
Symptom check list in Italian and Thai campbellteaching.co.uk/covid1...
Virus shedding
www.nature.com/articles/s4159...
Vit D
pubmed.ncbi.nlm.nih.gov/32252...
Asymptomatic infection
www.medrxiv.org/content/10.11...
www.theguardian.com/world/202...
Boston homeless shelter
www.boston25news.com/news/cdc...
Dutch infection rates
www.reuters.com/article/us-he...
testing data
ourworldindata.org/covid-test...