Häufige Fragen (FAQ)

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How is COVID-19 contracted? How is COVID-19 transferred?


Mainly via infectious aerosols from indoor air.




What are aerosols? How do aerosols distribute in a room?



Aerosols quickly disperse through the principle of Brownian motion of molecules




Are 1.5m of distance sufficient?


Sufficient against droplet infection, inadequate for aerosol infection




Why do masks only offer limited protection?


-Mouth and nose masks mainly protect against droplet infection -FFP2 face masks don’t fit tight enough at the nose and cheeks. -Fine aerosols can pass through gaps and sometimes through the masks themselves. -FFP2 masks reduce viral load only up to approx. 79%.




Is ventilation effective and sufficient?


Ventilation is only effective when there is:

-air flow -a temperature difference between indoor and outdoor air




Does a protective wall help against aerosol infections?


Protective walls hardly help against aerosol infections.




How is the effectiveness of a vaccine to be understood?Does the 95% effectiveness mean that you are 95% protected?