Dana Cole of the Sierra Vista Herald Review reports:

A team of health professionals from the Centers for Disease Control and Prevention is in Sierra Vista, Arizona to assist with an investigation that has been frustrating state and local health officials.

A salmonella outbreak that started on Sept. 1 has spiraled to 45 cases, with no answer as to the cause or mode of transmission. State and local health officials have been working together for months in an effort to isolate the source of the problem, only to hit a dead end.

During the months that local and state health officials have been researching the outbreak, they have canvassed restaurants, schools, daycare facilities, nursing homes and cafeterias. Water testing also was done.