How exposure dose affects the outcome if you are infected with SARS-CoV-2.On the topic of exposure dose:And on the matter of masks: camera phoneCheck3Coronaviruscoronavirus immune systemcovidCOVID-19COVID19doseexposurefreeimmune systemIMMUNITYImportanceKatzREALITYsharinguploadvideovideo phoneVITAMINvlogYouTube