One case of salmonella in Wisconsin linked to nationwide outbreak

(CNN) -- Officials have confirmed one case of salmonella in Wisconsin, related to a nationwide outbreak linked to a top selling brand of chicken.

USDA inspectors believe California-based "Foster Farms" is to blame for sickening more than 275 people in 18 states over the past six months.

The chicken authorities are concerned about is stamped with the number P-6137-A. The raw chicken in question carries the USDA codes P-6137, P-6137-A or P-7632.

The Department of Agriculture issued the health alert on Tuesday, October 8th, saying at least 278 people fell ill in 18 states since last March -- with most of the illnesses in California.

Officials say those most at risk include those who have low immune systems, those with children -- and the elderly.

Officials say strains of salmonella are associated with the chicken, produced at three undisclosed Foster Farms facilities in California's central valley.

There is an easy way to prevent salmonella -- making sure the chicken is thoroughly cooked to at least 165 degrees internal temperature, and checking the chicken with a meat thermometer.

In extreme cases, salmonella can be fatal. Health officials say those who suffer diarrhea or stomach cramps after eating should call their doctor.