a scientist using a pipette to inject colorless liquid into a raw hamburger patty on a stainless steel tray

laboratory testing hamburger patty scientist pipette colorless liquid injection raw meat food science microbiology quality control safety coli salmonella foodborne illness agar plate petri dish culture media bacteria growth incubation contamination sanitation sterile aseptic technique glasses gloves lab coat research analysis experiment production processing regulations usda fda public health consumer