Polymerase chain reaction (PCR) tests now account for 60 percent of one food-testing company's E. coli O157 screenings

Polymerase chain reaction (PCR) tests now account for 60 percent of one food-testing company's E. coli O157 screenings

Polymerase chain reaction (PCR) tests now account for 60 percent of one food-testing company?s E. coli O157 screenings


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