evidence: COVID-19 is caused by a "novel" coronavirus, meaning it's not just a new strain of something we've seen before, but a wholly new virus, recently jumped from a different animal host. Our bodies have a rich arsenal of antibodies, but none of them recognizes this bug, so it rages completely unfettered while our bodies scramble to raise new antibodies to fight it. During the 6-10 days that it takes to do that, the virus has already ravaged our respiratory epithelium (the lining of our airways), leaving us with painful breathing, poor oxygen absorption, and leaving us wide open to pneumonia, both bacterial and viral. It's serious, it's dangerous, it's not a hoax, and it will KILL A LOT OF PEOPLE if we don't take the lockdown seriously.