Three children under the age of ten are among 12 people in Virginia sickened in a salmonella outbreak that has affected nearly 400 people across the nation.

Virginia Department of Health spokesman Philip Giaramita says the cases have been reported across the state, including three in Northern Virginia.

Officials with the U.S. Centers for Disease Control and Prevention say all the cases in the 42-state outbreak have been genetically fingerprinted as the Typhimurium type, which is among the most common forms of salmonella food poisoning.

Most people infected with salmonella develop diarrhea, fever and abdominal cramps 12 to 72 hours after infection. The illness usually lasts four to seven days, and most people recover without treatment.