The length of stay in closed rooms is particularly decisive in the spread of the corona virus.

The longer you stay in a room, the more aerosols are inhaled and thus the risk of becoming infected increases.

This was shown by scientists from the TU Berlin together with the Robert Koch Institute and the Charité Berlin in a study.

They investigated the area in which the microscopic particles, which are emitted especially when sneezing and coughing, but also when breathing, speaking and singing, by people infected with Covid 19, are particularly common.

The scientists led by ventilation expert Martin Kriegel wanted to know how these aerosols are distributed in closed rooms.

From this, they derived how strongly non-infected people are exposed to an infection risk, for example in schools, when visiting the hairdresser or cinema or when shopping in the supermarket.

For the study, the researchers developed an infection risk model and derived a situation-dependent reproductive value, R for short.

At R-1, exactly one other person is infected with the corona virus.

Different situations in closed rooms were examined.

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