Mystery Listeria Outbreak Traced to Florida

Most of those sickened either live in or traveled to the state

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 month before they became ill.

Listeria infection is a foodborne bacterial illness that can be very serious for pregnant women, people older than 65 and people with weakened immune systems.

It's most commonly caused by eating improperly processed deli meats and unpasteurized milk products.