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Use "unsterile" in a sentence
"People who used intravenous drugs, snorted cocaine with a shared straw, or had an unsterile tattoo or body piercing could be infected with hepatitis C and not realize it."
"Very lucky, I was told, considering the unsterile nature of goldfish ponds."
"Any nurse would know the consequences for a patient: pain during surgery and possibly serious infection from unsterile saline, he said."