Thread by @bopinion

These are the places Covid-19 spreads in the real world:

🖥Workplaces
🍽Restaurants
⛪️Churches
🎈Parties

It doesn't really spread here:

🌳Public parks
🏖Beaches
🛒Quick trips to the grocery store trib.al/wHSoU43

Scientists are starting to get a handle on how the novel coronavirus behaves. We now know that the two drivers of the spread of the disease are:

1) Close contact
2) Crowding in closed space trib.al/wHSoU43

You've probably heard that each infected individual transmits the virus to between two and three others on average.

But the important point, which is often missed, is that this is just an average trib.al/wHSoU43

In the real world, most people transmit the disease to nobody, and a minority infect many others in super-spreading events.

Only 9% of infected people are responsible for 80% of the transmissions trib.al/wHSoU43

Contact tracing studies show people are most infectious right around the onset of symptoms.

If someone in that stage goes to a party, or church service, or to work in a meat packing plant or nursing home, many other people will probably get sick trib.al/wHSoU43

People think if you get exposed, you'll automatically get sick or become infectious, but that's not always the case.

Even people exposed to sick family members in their homes don’t always get sick trib.al/wHSoU43

People passing by you in a supermarket are unlikely to infect you. ⛅️Outdoor environments appear much safer as well.

In one study, which followed hundreds of cases, all but one transmission occurred indoors trib.al/wHSoU43