Attendance at the Margarita Mix-Off held at Manzanita Place, in Chico, California, on May 8, was associated with an outbreak of Salmonella. The event was hosted by a local caterer. The strain of Salmonella involved in the outbreak was described as relatively rare, but was not revealed in the press announcement by the Butte County Health Department on June 3. The margaritas were suspected as the vehicle of infection.