42% of the population in Ischgl Austria had antibodies. Out of tthose 85% were never confirmed infected. Thats good news or bad news depending on the angle. There was also a study st a hospital in France where all but 1 person had antibodies out of the confirmed infected. All cases mild.
One has to dig into the specifics of the individual test, because antibodies from other coronaviruses, like the common cold, can also produce a positive result.
Also, one of the theories posited by the scientific community for the origin of SARS-CoV-2 is that it is a mutation of a harmless coronavirus that has already been in humans for years. This would help explain the very high positive numbers to studies where fill communities have been tested, since it is unlikely that everyone in the community managed to contract the same virus from close contact within a period of 7 months.
All of this simply reinforces the point that we don't know enough and making assumptions that it is not something to be concerned about is....well you know what they say about assumptions.
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Well, the virologists at the university of Innsbruck who did the testing said there is zero chance of false positives (the specificity of the testing method is 100%) and my base case is that they know what they are doing. And since they tested 90% of the population for antibodies its only like 1500 tests conducted given how few actually live there.
As for Ischgl, I'd say its pretty likely that a large share of the locals there got infected during a short time period given how easily Covid-19 seems to spread. Its a tiny village high up in the Austrian Alps. In the skiing season they get a
massive influx of people from all over Europe (big and popular ski resort) and tons of tourists got infected there and a very large part of the population work in hospitality one way or another and get exsposed to a lot of people.
This is how it looks, along the valley from one end to another it's 0.6 miles total distance. Now imagine the 1700 locals + thousands of ski tourists staying in that tiny area. This tiny cluttering of houses has around 12.000 tourist beds and > 1.3 million bed-nights per winter season. I'd say its entirely plausible Covid-19 could spread very widely and quickly in a place like this, which also is what the antibody study finds actually happened. It is one of the well-known early Eruopean epicentres where a lot of cases got exported from by tourists who returned to their home country. Remember, this all happened before Covid-19 was really a thing and no precautions were taken.