The most important and effective measures for personal protection as well as for the protection of other people are: keeping your distance (at least 1.5 meters), good hand hygiene and observing coughing and sneezing rules. Everyday masks also help to contain the spread of the virus. Wearing an everyday mask helps to protect other people from fine droplets and particles that are expelled when talking, coughing or sneezing, for example. It is important that the mouth and nose are covered. First scientific evidence confirms the protective effect. As the amount of time spent in closed rooms increases as the outside temperature falls, adequate ventilation must be provided there. Reason: possible virus-containing aerosols can float longer in the air. Sufficient ventilation helps to transport them away.