In February 2013 the Alaska Division of Public Health announced an outbreak of Campylobacter coli (C. coli) linked to consumption of raw (unpasteurized) milk distributed by Kasilof Dairy, a Kenai-based cow-share program. In total 31 cases were identified in the outbreak. Ill persons ranged in age from 7 months to 72 years. Onsets ranged from January 8 to February 13. Three children and one adult developed reactive arthritis lasting a minimum of 6 weeks. Two persons were hospitalized. All ill persons were Kenai Peninsula residents who either personally consumed raw milk from Kasilof Dairy within 10 days of illness onset (n=29) or met the secondary case definition (n=2).

Public health investigators collected cow feces, milk and other environmental samples from Kasilof Dairy. The outbreak strain of C. coli was not isolated from the samples collected at the farm; however, three different strains of C. jejuni were isolated form cow manure, and Listeria monocytogenes from a raw milk sample.