Arizona has seen more than twice the number of infections caused by the specific salmonella strain associated with millions of recalled eggs since mid-May.
Health Services Department food-borne disease epidemiologist Joli Weiss says investigators haven't been able to determine which infections are normal background and which can be attributed to the recalled eggs.
No deaths have been reported, and a total number of hospitalizations wasn't available.
The state normally sees two to three cases a month, but the number surged to 16 in June.
An Iowa egg producer began recalling eggs on Tuesday and it surged to 380 million on Wednesday.
Weiss says undercooked eggs or products like homemade salad dressing or mayonnaise that use raw eggs can spread the disease.