Department of Health and Mental Hygiene officials say a DNA fingerprinting completed Friday shows that a Baltimore city resident's salmonella infection matches the strain involved in the national outbreak. The patient has not been hospitalized.

Officials say the specific source of this infection may never be known.

DHMH Secretary John Colmers says it is possible that more cases will be identified.

Symptoms of salmonella include fever, diarrhea and abdominal cramps. Salmonella can cause life-threatening infections of people with weakened immune systems or other health conditions, but most people recover without treatment.