The U.S. has updated its guidance on how COVID-19 spreads, stating that the virus can spread even beyond six feet, or 1.8 meters, of social distance indoors. Previously, the U.S. Centers for Disease Control and Prevention had emphasized that most infections are spread through "close contact, not airborne transmission." A Taiwan virologist said Monday that he agreed with the revised guidance. He said that even 10 meters of distance may not be enough in an enclosed space, and that the key is not social distance, but proper ventilation.

On the MRT, everyone keeps their masks firmly on. Taiwan’s health authorities advise people to maintain 1 meter of social distance outdoors and 1.5 meters indoors. But in its latest guidance, the U.S. CDC says that even 1.8 meters of social distance may not be enough.

Member of the public
I get quite uneasy. I try to keep away from places with lots of people and with poor ventilation.

Member of the public
We shouldn’t worry so much in Taiwan. With such a small chance of contagion, there’s no need to increase our mental burden or to estrange ourselves from one another.

The U.S. CDC’s latest guidance emphasizes that COVID can be spread through aerosolized particles that can travel distances beyond 6 feet, or 1.8 meters. And according to Taiwan experts, tiny infected droplets can pass through face masks.

Huang Li-min
Infectious Diseases Society of Taiwan
If you are in prolonged contact with an infected person who is 1.8 meters, even if they are wearing a face mask, you might get infected anyway. Because there will be some small airborne particles that won’t be blocked by the face masks. Say there are aerosols in the air. Even if you are 10 meters away, it’s no use, you can still be infected. That’s right. But that’s under the condition that you are in an enclosed space.

The virus can stay airborne for several hours. Dr. Huang says maintaining social distance is one important countermeasure. Airing out indoor spaces is also key.

Huang Li-min
Infectious Diseases Society of Taiwan
Air out the space four to six times every hour. You must abide by two principles when doing so. One is, the air you bring in should be from the outside – you can’t have the same air circulating. If you don’t bring in outside air, then you have to use an air filter.

Taiwan authorities haven’t commented on whether new guidelines are on the way. But experts say that in any case, ventilation is crucial in enclosed spaces. That, along with maintaining proper personal hygiene, can keep infection risk at a minimum.