biohazard warning sign |
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navigate by keyword : agent alert area attention bacterial beware bio biohazard biologic biological caution closeup contagious contaminated contamination danger dangerous dark environment green hazard hazardous hazmat illustration infectious information notice poison pollution protect protection red restricted risk road roadsign sign signal sky substance symbol threat toxic triangle virus warning waste weapon yellow |
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Biohazard warning sign on against dark cloudy sky. |
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