The CDC warns Americans about a Listeria outbreak in precooked chicken just before July 4th celebrations.Three people were hospitalized, and one died after they ate precooked chicken in a hospital or long-term care facility in Texas and Delaware.Listeria can be recovered in some cases without the need for medical attention. Symptoms may not appear for up to four weeks.LEGIONNAIRES' ABREAK AT OREGON PARTMENT COMPLEX LEAVES ONE DEADThe CDC is still investigating and recommends that you "reheat precooked poultry to an internal temperature between 165F and 165F" and not eat "any cold dishes with precooked chicken such as deli chicken salad or salads with chicken sold at a deli counter, a salad bar, or in the refrigerated section.All the illnesses linked to this outbreak were found in hospitals or long-term care facilities.The CDC states that pregnant women, seniors 65 and older, as well as people with weakened immune systems, are more at risk of severe illness.CLICK HERE FOR THE FOX NEWS APPListeria is caused primarily by Listeria monocytogenes. Although it is rare in pregnancy, it can cause minor illnesses in women. However, it can be fatal to the baby and fetus, potentially leading to miscarriage, stillbirth or premature birth.According to the CDC, approximately 1,600 Americans get it each year. It can lead to death in around 20% of cases.