coronavirus covid-19 public poster with a red warning triangle and the text in german `maskenpflicht`

area attention black caution corona coronavirus covid covid19 danger drawn dust epidemic face facemask flat flu german graphic hand head health healthy human hygienic icon illustration infection info infographic information instruction mark mask maskenpflicht measure medical notice person please pollution poster prevention print product protection public quick red required respiratory safe safety sign simple style surgical symbol text triangle vector virus warning wear wearing written