An investigation is underway to identify the food source responsible for a multistate outbreak of listeria infections primarily involving people who either live in Florida or traveled there prior to becoming sick.

As of June 29, a total of 23 cases of listeriosis, a bacterial infection usually caused by eating food contaminated with listeria, were recorded in 10 states, causing 22 hospitalizations and one death.

According to the Centers for Disease Control and Prevention (CDC), 20 of the infections were reported from people who are Florida residents or who traveled to Florida

The other states involved in the outbreak are Colorado, Georgia, Illinois, Kansas, Massachusetts, Minnesota, New Jersey, New York and Pennsylvania.

Sick people ranged in age from under 1 to 92, with a median age of 72. Illnesses started to be reported between Jan. 24 and June 12

Public health officials are continuing to interview infected people about the foods they ate the month before they got sick.

So far, a common food source has not been identified. It takes up to four weeks for health officials to determine if a sick person is part of an outbreak.​​