תסמינים, הידבקות, חיסונים, חסינות

https://edition.cnn.com/2020/07/17/health/covid-19-coronavirus-need-to-know-now-wellness-trnd/index.html https://news.sky.com/story/coronavirus-six-types-of-covid-19-identified-by-scientists-in-major-breakthrough-for-treatment-12030652 https://news.sky.com/story/coronavirus-tracking-every-global-effort-to-find-a-covid-19-vaccine-12030675 https://www.dailymail.co.uk/news/article-8534713/Hopes-long-lasting-Covid-19-immunity-scientists-believe-T-cells-years.html