Another case of salmonella has been confirmed in the greater Sierra Vista area, bringing the number to 21, according to Cochise County health officials.

Last week, health officials identified a cluster of Salmonella Oranienburg in this region when 20 confirmed cases were reported, mostly in young children and adults, according to the Douglas Dispatch.

"We still haven’t pinpointed a source," said Karla Jensen, spokeswoman for the Cochise County Health Department. "We’re working with the state to try and track where this is coming from, but haven’t had any luck yet."

County and state health officials are working to isolate and prevent any further spread of the disease by communication with local health care providers, schools, and daycare centers