A new study conducted by MIT scientists and released this week reveals that the six foot social distancing and limited occupancy guidelines made law in most of the civilized world have done little to slow the spread of COVID-19, and suggests the only way to reduce the spread of COVID-19 is to limit exposure to highly populated areas and areas where people are physically exerting themselves, such as gyms, or areas where people are singing or speaking, such as churches.
The study reveals that the social distancing guidelines employed throughout much of the world for over a year have done nothing to limit the spread of COVID-19, suggesting that the adaption of the guidelines did not stop the spread of the of the China-originated virus, and it can only be slowed with the employment of severe lockdowns. Paradoxically, states and cities that have engaged in severe lockdowns have seen the largest spikes of COVID-19.
“We argue there really isn’t much of a benefit to the 6-foot rule, especially when people are wearing masks,” MIT professor Martin Z. Bazant said, as reported by NBC. “It really has no physical basis because the air a person is breathing while wearing a mask tends to rise and comes down elsewhere in the room so you’re more exposed to the average background than you are to a person at a distance.”
In other words, widespread mask wearing may simply change the physical vectors of transmission within a given room rather than stop it, effectively making six foot distancing rules pointless.
In well-mixed spaces, “one is no safer from airborne pathogens at 60 feet than 6 feet,” they said.
The important variable CDC and World Health Organization guidelines have overlooked is the amount of time spent indoors, Bazant said. The longer someone is inside with an infected person, the greater the chance of transmission, he said.
Opening windows or installing new fans to keep the air moving could also be just as effective or more effective than spending large amounts of money on a new filtration system, he said.
Bazant also says that guidelines enforcing indoor occupancy caps are flawed. He said 20 people gathered inside for one minute is probably fine, but not over the course of several hours, he said.
Small, poorly ventilated spaces where a lot of people spend a lot of time together places people at the most risk, he said.
“Unfortunately, the nursing home is one of those cases. If Covid patients are living together 24/7, in some cases even in the same room, that is the absolute worst-case scenario, especially given the vulnerability of that population,” Bazant added.
On the other hand, their analysis shows that many places that were shut down didn’t necessarily need to close, he said.
“Often times the space is large enough, the ventilation is good enough, the amount of time people spend together is such that those spaces can be safely operated even at full capacity and the scientific support for reduced capacity in those spaces is really not very good,” Bazant said, citing some university classrooms. “I think if you run the numbers, even right now for many types of spaces you’d find that there is not a need for occupancy restrictions.”
Social distancing and occupancy rules that have resulted in closed businesses and schools are oversimplified, according to Bazant.
“This emphasis on distancing has been really misplaced from the very beginning. The CDC or WHO have never really provided justification for it, they’ve just said this is what you must do and the only justification I’m aware of, is based on studies of coughs and sneezes, where they look at the largest particles that might sediment onto the floor and even then it’s very approximate, you can certainly have longer or shorter range, large droplets,” Bazant said.
“The distancing isn’t helping you that much and it’s also giving you a false sense of security because you’re as safe at 6 feet as you are at 60 feet if you’re indoors and the air is getting well mixed. Everyone in that space is at roughly the same risk, actually,” he noted.
Pathogen-laced droplets travel through the air indoors when people talk, breathe or eat. It is now known that airborne transmission plays a huge role in the spread of Covid-19, compared with the earlier months of the pandemic where hand-washing was considered the leading recommendation to avoid transmission.
Those droplets from a person’s warm exhalation mix with body heat and air currents in the area to rise and travel throughout the entire room and put everyone in a well-mixed room at risk of airborne transmission.
People seem to be more exposed to that “background” air than they are by droplets from a distance, like secondhand smoke, according to the study.
For example, if someone infected with Covid-19 is wearing a mask and singing loudly in an enclosed room, a person who is sitting at the other side of the room is not more protected than someone who is sitting just 6 feet away from the infected person. This is why time spent in the enclosed area is more important than how far you are from the infected person.
Masks work in general to prevent transmission by blocking larger droplets, therefore larger droplets aren’t making up the majority of Covid infections when most people are wearing masks. The majority of people who are transmitting Covid aren’t coughing and sneezing, they’re asymptomatic, Bazant said.
Masks prevent indoor transmission by both filtering exhaled infectious droplets and blocking exhaled jets of air, best visualized by imagining someone exhaling smoke. Exposure to these jets of infectious air results in a higher risk of transmission, relative to that of the well-mixed background, Bazant said he and Bush determined in an earlier study.
Masks help indoor transmission by both filtering exhaled infectious droplets and blocking exhaled jets of air, which can be seen when a smoker exhales. Exposure to exhaled jets of infectious air results in a higher risk of transmission, relative to that of the well-mixed background, Bazant and Bush said.
Those in the same room as a smoker are heavily affected by the secondhand smoke that makes its way around the enclosed area and lingers. The same logic applies to infectious airborne droplets in well-mixed room, according to the study. When indoors and masked, factors besides distance can be more important to consider to avoid transmission.
Though Bazant and Bush’s study didn’t specifically look at outdoor transmission, Bazant said social distancing makes little sense outdoors since warmer air that’s exhaled tends to rise and any infected air would be swept away by the wind.
“Air follows the path of least resistance and often times with many masks, that’s straight up,” Bazant said. “Exhaled air is obviously much warmer than the background and tends to rise. That’s, by the way, the main reason that distancing outside makes almost no sense, and especially with masks, it’s even kind of crazy because you’re really not going to transmit to someone at 6 feet. – CNBC.com
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