In an article that The Atlantic classifies as “politics” rather than “science” or “medicine”, Olga Khazan explores why, more than 8 months into the pandemic, Americans still have little idea about the safety of gathering with others indoors.
For months now, Americans have been told that if we want to socialize, the safest way to do it is outdoors, the better to disperse the droplets that spew from our mouths whenever we do anything but silently purchase grapefruit. But in many parts of the country, this is the last month that the weather will allow people to spend more than a few minutes outside comfortably. And next month, America will celebrate a holiday that is marked by being inside together and eating while talking loudly to old people.
In a nutshell, the lack of federal support/guidance/action is the main reason why people are still so confused about what safety measures to take to reduce their Covid risk:
Still, Ranney says, this [Covid risk] app is the kind of thing the federal government really should have developed by now. It’s odd that in a wealthy, industrialized country, a random researcher is the one designing a tool to keep citizens safe from public-health threats, using data she scraped from a newspaper.
One thing that Khazan doesn’t really get into is the whole aerosols thing, which in my mind is something that most people are still not familiar with, many local & state governments are not taking into account w/r/t recommended safety measures, and requires different risk guidance about the safety of the indoors than if we were just dealing with fomites & droplets. Again, from the excellent Time magazine piece by aerosol chemist Jose-Luis Jimenez:
When it comes to COVID-19, the evidence overwhelmingly supports aerosol transmission, and there are no strong arguments against it. For example, contact tracing has found that much COVID-19 transmission occurs in close proximity, but that many people who share the same home with an infected person do not get the disease. To understand why, it is useful to use cigarette or vaping smoke (which is also an aerosol) as an analog. Imagine sharing a home with a smoker: if you stood close to the smoker while talking, you would inhale a great deal of smoke. Replace the smoke with virus-containing aerosols, which behave very similarly, and the impact is similar: the closer you are to someone releasing virus-carrying aerosols, the more likely you are to breathe in larger amounts of virus. We know from detailed, rigorous studies that when individuals talk in close proximity, aerosols dominate transmission and droplets are nearly negligible.
If you are standing on the other side of the room, you would inhale significantly less smoke. But in a poorly ventilated room, the smoke will accumulate, and people in the room may end up inhaling a lot of smoke over time. Talking, and especially singing and shouting increase aerosol exhalation by factors of 10 and 50, respectively. Indeed, we are finding that outbreaks often occur when people gather in crowded, insufficiently ventilated indoor spaces, such as singing at karaoke parties, cheering at clubs, having conversations in bars, and exercising in gyms. Superspreading events, where one person infects many, occur almost exclusively in indoor locations and are driving the pandemic. These observations are easily explained by aerosols, and are very difficult or impossible to explain by droplets or fomites.
The science is there — it’s the lack of connection between scientists, public health experts & officials, and the government that continues to be a problem.
Tags: COVID-19 Jose-Luis Jimenez Olga Khazan politics sciencefrom kottke.org https://ift.tt/3jVnnsj
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