Salmonella, Shigella, Campylobacter and Escherichia coli O157:H7 not isolated
salmonella, shigella, campylobacter and escherichia coli o157:h7 not isolated
Salmonella, Shigella, Campylobacter and Escherichia coli O157:H7 not isolated (finding)
salmonella, shigella, campylobacter and escherichia coli o157:h7 not isolated (finding)