For many, COVID has been a devastating virus, but there are people who don't exhibit any symptoms at all. Why is that? You can find all of our latest episodes regarding the COVID-19 pandemic here:    • COVID-19 News & Updates   Hosted by: Michael Aranda SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at http://www.scishowtangents.org/ ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Silas Emrys, Drew Hart, Jeffrey Mckishen, James Knight, Christoph Schwanke, Jacob, Matt Curls, Christopher R Boucher, Eric Jensen, Adam Brainard, Nazara, Growing Violet, Ash, Laura Sanborn, Sam Lutfi, Piya Shedden, Katie Marie Magnone, Scott Satovsky Jr, charles george, Alex Hackman, Chris Peters, Kevin Bealer, Alisa Sherbow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com/ Instagram: http://instagram.com/thescishow ---------- Sources: https://pubmed.ncbi.nlm.nih.gov/32918943/ https://doi.org/10.1126/science.abf9569 https://doi.org/10.3390/ijerph17249290 https://doi.org/10.1016/S1473-3099(20)30837-9 https://doi.org/10.3389/fragi.2020.602108 https://doi.org/10.1136/archdischild-2020-320338 https://pubmed.ncbi.nlm.nih.gov/33262177/ https://doi.org/10.1016/S2352-4642(20)30135-8 https://doi.org/10.1136/bmj.m4944 https://doi.org/10.1001/jama.2020.8707 https://doi.org/10.1186/s13578-020-00519-8 https://doi.org/10.1038/s41385-020-00359-2 https://pubmed.ncbi.nlm.nih.gov/33254487/ https://doi.org/10.1038/s41467-020-18781-2 https://doi.org/10.1016/j.jaci.2020.04.009 https://doi.org/10.3389/fimmu.2020.611337 https://doi.org/10.1136/bmj.m3364 https://pubmed.ncbi.nlm.nih.gov/32454136/ https://10.1126/scitranslmed.abd2223 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7554241/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7522676/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7205667/ https://doi.org/10.1126/science.abd4570 https://doi.org/10.3389/fimmu.2020.595739 https://doi.org/10.1038/s41577-021-00522-1 https://doi.org/10.1084/jem.20202617 https://doi.org/10.1038/s41577-020-00460-4 https://doi.org/10.1172/JCI144807 https://doi.org/10.3389/fimmu.2020.567710 https://doi.org/10.1186/s41231-020-00067-w https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6518513/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4750592/ https://doi.org/10.1038/s41591-020-0965-6 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4368196/ https://doi.org/10.1111/imcb.12419 https://doi.org/10.7326/M20-3012