[BostonCard]

I don't see how washing hands a lot helps much.  The virus spreads by aerosols, and in a (relatively) small room like a classroom, that's going to be a big problem.

I don't think it is generally true that the virus spreads by aerosols.
CDC: https://www.cdc.gov/coronavirus/2019-nco...tsheet.pdf

• You can become infected by coming into close contact (about 6 feet or twoarm lengths) with a person who has COVID-19. COVID-19 is primarily spread from person to person.
• You can become infected from respiratory droplets when an infected person coughs, sneezes, or talks.
• You may also be able to get it by touching a surface or object that has the virus on it, and then by touching your mouth, nose, or eyes.

WHO: https://www.who.int/news-room/q-a-detail...onaviruses

How does COVID-19 spread?

People can catch COVID-19 from others who have the virus. The disease spreads primarily from person to person through small droplets from the nose or mouth, which are expelled when a person with COVID-19 coughs, sneezes, or speaks. These droplets are relatively heavy, do not travel far and quickly sink to the ground. People can catch COVID-19 if they breathe in these droplets from a person infected with the virus. This is why it is important to stay at least 1 metre (3 feet) away from others. These droplets can land on objects and surfaces around the person such as tables, doorknobs and handrails. People can become infected by touching these objects or surfaces, then touching their eyes, nose or mouth. This is why it is important to wash your hands regularly with soap and water or clean with alcohol-based hand rub.

WHO is assessing ongoing research on the ways that COVID-19 is spread and will continue to share updated findings.

I think the evidence is that the dominant mode of transmission is via droplets. While I don't think we can exclude aerosols entirely (and it has been established that in certain procedures, like intubation, aerosols are generated), it doesn't seem to be the dominant form of transmission.

BC

[BostonCard]

I don't see how washing hands a lot helps much.  The virus spreads by aerosols, and in a (relatively) small room like a classroom, that's going to be a big problem.

I don't think it is generally true that the virus spreads by aerosols.
CDC: https://www.cdc.gov/coronavirus/2019-nco...tsheet.pdf

• You can become infected by coming into close contact (about 6 feet or twoarm lengths) with a person who has COVID-19. COVID-19 is primarily spread from person to person.
• You can become infected from respiratory droplets when an infected person coughs, sneezes, or talks.
• You may also be able to get it by touching a surface or object that has the virus on it, and then by touching your mouth, nose, or eyes.

WHO: https://www.who.int/news-room/q-a-detail...onaviruses

How does COVID-19 spread?

People can catch COVID-19 from others who have the virus. The disease spreads primarily from person to person through small droplets from the nose or mouth, which are expelled when a person with COVID-19 coughs, sneezes, or speaks. These droplets are relatively heavy, do not travel far and quickly sink to the ground. People can catch COVID-19 if they breathe in these droplets from a person infected with the virus. This is why it is important to stay at least 1 metre (3 feet) away from others. These droplets can land on objects and surfaces around the person such as tables, doorknobs and handrails. People can become infected by touching these objects or surfaces, then touching their eyes, nose or mouth. This is why it is important to wash your hands regularly with soap and water or clean with alcohol-based hand rub.

WHO is assessing ongoing research on the ways that COVID-19 is spread and will continue to share updated findings.

I think the evidence is that the dominant mode of transmission is via droplets. While I don't think we can exclude aerosols entirely (and it has been established that in certain procedures, like intubation, aerosols are generated), it doesn't seem to be the dominant form of transmission.

BC