Which organism is specifically identified as associated with raw milk outbreaks during 1993-2006 among the most common pathogens?

• A. Campylobacter
• B. E. coli O157 (raw milk)
• C. Norovirus
• D. Listeria monocytogenes

Answer: (B)

Raw milk bypasses pasteurization, so any contaminating pathogen in the cow or environment can be transmitted directly to people. During 1993–2006, outbreak data repeatedly pointed to E. coli O157:H7 as the organism most commonly linked to unpasteurized milk. This strain is particularly virulent and can cause severe illness, including hemorrhagic colitis and the potential for hemolytic uremic syndrome, making it a standout risk specific to raw-milk outbreaks in that period. While other pathogens can be associated with dairy, the surveillance during these years highlighted E. coli O157:H7 as the primary association with raw milk outbreaks.