Eggs hard-boiled at home have not been linked to the listeria contamination, officials said Wednesday.
Seven people in five states -- Florida, Pennsylvania, South Carolina, Maine and Texas -- have been infected with the listeria strain at the center of the latest outbreak between April 2017 and November 2019, according to the CDC. Two of the cases occurred in 2017 while three were reported starting in August 2019. Those who fell ill are between 1 and 82 years of age, with a median age of 75 years old, officials said.
One person who fell ill in Texas has died from the infection, according to the CDC.
Officials with the U.S. Food and Drug Administration and the CDC are investigating the outbreak.
Symptoms of listeria infection include fever, muscle aches, headache, stiff neck, confusion and convulsions, according to the CDC. Pregnant women who are infected often experience only fever and other flu-like symptoms, but officials warned a listeria infection during pregnancy can lead to miscarriage.
The infection can be treated with antibiotics.