Sing makes you happy alone, under the shower, in the audience at the rock concert, celebrating on the ball man, and especially in the choir. Two million people in Germany, sing in a more or less professional choirs. Together, they study the songs and samples for the appearance in churches, concert halls or even just at the village.
Corona has the performances, but also the samples brought to a standstill. As a relatively early, it became clear that when they Sing, especially many of the large and especially small droplets, called aerosols, are released. Some of the most striking eruptions were triggered samples by a choir, because one of the singers with Sars-CoV-infected 2. She went as a super-spreading Events in the history of the pandemic.
A super-spreader infected almost all of his Church choir
At the best a case in the American state of Washington is documented In Mount Vernon, were at 10. March 61 members of a Church choir to the sample taken. A singer of cold symptoms had, a short time later 52 for more choir members to Covid-19 ill, some seriously. Two elderly choir members died. The eight singers, the non-infected, were furthest from the “super spreader” away.
From these experiences, the scientists concluded that viruses are not transmitted only by relatively large and heavy droplets, which escapes with a distance of 1.5 meters easily. Viruses are also shoehorned in suspended particles, aerosols, alone, on the Exhale out of the body. And in these aerosols as they waft through the air and are distributed evenly in the room.
- All of the new developments in Live-Ticker for the pandemic
Since then, will be considered, in experiments tested how big is the risk of Infection at the Singing actually is, what distance and what precautions are necessary so that the choir singers can pursue your profession or your Hobby. Singing behind screens is not a good solution. Not only professional choirs estimate the undamped sound and the clearly audible articulation of their performance.
compositions for singers with mouth protection
The Bavarian radio chorus, however, has already two plants for singers with mouth protection in order given.
Previously carried out by 10 members of the choir under the guidance of scientists of the Ludwig-Maximilian-University and the University of Erlangen, an Experiment that investigated the spread and distribution of the droplets, and aerosols in the room in more detail below. Aim of the Sing to find out under what circumstances in the Corona times, health would be justifiable.
BR/know a Good singer when Aerosol Experiment at the BR radio chorus
The singers should be well-defined passages in different talk according to the strengths and sing. Then it was analyzed, how the aerosols, nose and mouth left and how they spread in the room. The subjects inhaled a carrier solution of E-cigarettes, which was then at and after the Singing in the white light as a breath, a cloud is visible.
, Greater distance to the front than to the side, it is necessary to
found: To should the gentlemen to the front of the choir members maintain a greater distance than to the page: Up to 2.5 meters are recommended as safety distance, the side 1.5 meters sufficed. Provided always, that the space is continuously ventilated, and therefore the aerosols are regularly removed by fresh air.
the results of The yet unpublished study, should not only be the BR-choir is helpful. In the case of professional choirs in the concert and Opera sector, as well as in the Amateur choir singing a great deal of uncertainty exists in the world and they need to Know how it goes with the choir to sing, as long as there is little long-term protection against corona virus.
100 Times more aerosols while Singing than when you Exhale
A similar experimental preparation practiced by scientists from the TU Berlin with the Rias Kammmerchor: Eight members should breathe in a clean-air space directly in a glass tube, read, and, finally, sing. A laser particle counter recorded the number and size of the ejected droplets. Have been counted all particles less than five microns by dimensions. They are considered to be aerosols.
The result: While Breathing only five to 85 of particles produced per second, there were droplets in the Singing between 750 and about 6000 of the finest. Individual singers were Singing almost a hundred times more Aerosol than in Speaking.
In a second work want to compare the researchers in the rehearsal room, a choir and two well-known concert halls with a typical office space in which two people sit. You want to find out, when a critical value by aerosols is achieved. The work is in a preliminary stage. Furthermore, it is not yet clarified, in which aerosol concentration contagious corona virus to be transmitted.
More on the topic of aerosols:
- aerosols are to blame for any second infection: Self-Ventilation does not always help
- Corona infection in Breathing: researchers know now that “aerosols” infectious
Shorter samples, less a singer, more fresh air
so, the threat during a choir practice in about the risk of lowering, the is also in normal office work. A limited sampling period and limited number of participants to ensure that: instead of the usual 60 to 80 singers, who practiced two hours, it is allowed to take the test for only 20 singers twice in 30 minutes. The singers must adhere to a two Meter distance, and in der15-minute break every window must be open.
The study comes to the Berlin choir of the world at just the right time. Because the Berlin Senate had the common Singing in enclosed spaces since the 27. June, for an indefinite period of time is prohibited. Previously, the radio choir and the Rias chamber choir had taken the test operation again. Now they hope that the Senate reconsider the decision again.
However, the effect of airing with Windows open is not so clearly restrict the study authors of the TU Berlin. The effect depended on temperature differences between indoors and outdoors, as well as the air movement.
Hardly Aerosol risk in the concert hall
the all-clear, the scientists give for concert halls with ventilation systems. In large, ventilated areas, aerosols are diluted quickly. Not only the concert would be relatively harmless, also choir samples could be held here without any problems.
in laboratory situations, such as with the Munich and Berlin choir singers lessons for the practice to win, especially for ventilation and proper Ventilation of enclosed spaces. Because this Knowledge is now backed up: move to Fresh air and, if possible, a little threading are the best way to dilute the aerosols so that they dissolve in the truest sense of the word in the air, and the contained viruses at the same time.
More than 200 scientists of various disciplines have addressed an appeal to the WHO. Requires an update to the Corona-guidelines, since the aerosol transmission is not sufficiently taken into account. The Air had to be involved in the daily protection measures explicitly. Corona-the early warning system via data donation to the fever card PCP Corona-the early warning system via data donation to the fever card
