coronavirus covid-19 public poster with a red warning triangle and the text in portugese `uso obrigatório de máscara`

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