The summary of the video is as follows:
The video begins by notifying the world about the spread of a virus, the Severe Acute Respiratory Syndrome-Related Coronavirus 2, or Covid-19, in December 2019. The virus spreads to other countries, causing cases to double within days.
The virus is a hull around genetic material and a few proteins, and it can only make more of itself by entering a living cell. It may spread via surfaces, but it's uncertain how long it can survive on them. Its main way of spreading seems to be droplet infection when people cough, or if you touch someone who's ill and then your face, say rubbing your eyes or nose.
The virus starts its journey in the intestines, the spleen, or the lungs,
1. The Severe Acute Respiratory Syndrome-Related Coronavirus 2 (Covid-19) was first detected in December 2019 in China and quickly spread to other countries.
2. The virus is a hull around genetic material and a few proteins, not a living thing.
3. The virus can only make more of itself by entering a living cell.
4. The virus can spread via surfaces, but it's uncertain how long it can survive on them.
5. The main way of spreading seems to be droplet infection when people cough, or if you touch someone who's ill and then your face.
6. The virus starts its journey in the lungs, and then hitches a ride as a stowaway deeper into the body.
7. Its destinations are the intestines, the spleen or the lungs, where it can have the most dramatic effect.
8. The virus connects to a specific receptor on its victim's membranes to inject its genetic material.
9. The cell, ignorant of what's happening, executes the new instructions, which are pretty simple: copy and reassemble.
10. The cell sort of melts away, releasing new corona particles ready to attack more cells.
11. The number of infected cells grows exponentially.
12. After about 10 days, millions of body cells are infected, and billions of viruses swarmed the lungs.
13. The virus has not caused too much damage yet, but corona is now going to release a real beast on you, your own immune system.
14. The immune system, while there to protect you, can actually be pretty dangerous to yourself and needs tight regulation.
15. As immune cells pour into the lungs to fight the virus, Corona infects some of them and creates confusion.
16. Cells have neither ears nor eyes. They communicate mostly via tiny information proteins called cytokines.
17. Nearly every important immune reaction is controlled by them.
18. Corona causes infected immune cells to overreact and yell bloody murder.
19. In a sense, it puts the immune system into a fighting frenzy and sends way more soldiers than it should, wasting its resources and causing damage.
20. Two kinds of cells in particular wreak havoc: neutrophils, which are great at killing stuff, including our cells, and killer T-cells, which usually order infected cells to commit controlled suicide.
21. Confused as they are, they start ordering healthy cells to kill themselves too.
22. The more and more immune cells arrive, the more damage they do, and the more healthy lung tissue they kill.
23. This might get so bad that it can cause permanent irreversible damage, that leads to lifelong disabilities.
24. In most cases, the immune system slowly regains control.
25. It kills the infected cells, intercepts the viruses trying to infect new ones and cleans up the battlefield.
26. Recovery begins.
27. The majority of people infected by Corona will get through it with relatively mild symptoms.
28. But many cases become severe or even critical.
29. We don't know the percentage because not all cases have been identified, but it's safe to say that there is a lot more than with the flu.
30. In more severe cases, millions of epithelial cells have died and with them, the lungs' protective lining is gone.
31. That means that the alveoli - tiny air sacs via which breathing occurs - can be infected by bacteria that aren't usually a big problem.
32. Patients get pneumonia.
33. Respiration becomes hard or even fails, and patients need ventilators to survive.
34. The immune system has fought at full capacity for weeks and made millions of antiviral weapons.
35. And as thousands of bacteria rapidly multiply, it is overwhelmed.
36. They enter the blood and overrun the body; if this happens, death is very likely.
37. The Corona virus is often compared to the flu, but actually, it's much more dangerous.
38. While the exact death rate is hard to pin down during an ongoing pandemic, we know for sure that it's much more cont