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A Listeria outbreak has sickened 23 people in the U.S., resulting in 22 hospitalizations and one death, the Centers for Disease Control and Prevention (CDC) announced (opens in new tab) Thursday (June 30).
These cases occurred between Jan. 24, 2021 and June 12, 2022, with 16 of the 23 cases occurring this year, the agency reported (opens in new tab).
Listeriosis is caused by a bacterium called Listeria monocytogenes, which can be found in soil, clindamycin diarrhea water, moist environments, decaying vegetables and dead animals, according to the Food and Drug Administration (opens in new tab) (FDA). The bacteria generally gets transmitted to people through contaminated food, as products can pick up the microbe at any stage of harvesting, processing or transport and the bug can survive and grow under refrigeration and other food preservation measures.
In the past, listeriosis outbreaks in the U.S. have been linked to a wide range of products, including unpasteurized milk, ice cream, smoked fish, hot dogs and raw or processed vegetables, among others. However, the CDC has not yet identified the food source of the current outbreak.
Cases have been documented in 10 states, including Colorado, Georgia, Illinois, Kansas, Massachusetts, Minnesota, New Jersey, New York, Pennsylvania and Florida, where 12 out of the 23 cases occurred. In total, 20 of the sickened people reported living in or traveling to Florida in the month before they got sick.
In general, L. monocytogenes is most likely to cause severe illness during pregnancy, as well as in newborns, people ages 65 and older and people with weakened immune systems, the CDC states. People outside these demographics can still contract the infection but rarely become seriously ill.
Symptoms typically appear within two weeks of eating contaminated food — although they can start as early as the same day or as late as 70 days after — and once they arise, symptoms may last for days or weeks. The infection can be treated with antibiotics.
Listeriosis may cause fever, muscle aches, headaches, a stiff neck, confusion, loss of balance and convulsions, the CDC states. The infection can also cause common food poisoning symptoms, such as nausea, vomiting and diarrhea. In severe cases, particularly in elderly and immunocompromised people, the bacteria can infect the bloodstream (sepsis) or brain (meningitis and encephalitis), according to the CDC (opens in new tab).
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While similar symptoms may arise during pregnancy, the main concern is that listeriosis can also lead to serious pregnancy complications, including miscarriage, stillbirth and premature delivery. Babies born with listeriosis infections can develop serious complications that require immediate treatment and can result in lifelong health issues or death, the FDA warns.
Five pregnant people became sick during the current outbreak, and one of these illnesses resulted in a “fetal loss,” the CDC reported.
To slow down or prevent the growth of L. monocytogenes in ready-to-eat refrigerated or frozen foods, the FDA recommends setting your refrigerator to 40 degrees Fahrenheit (4 degrees Celsius) or colder and the freezer to 0 F (-18 C) or colder.
Other preventative measures include:
- Washing the inside walls and shelves of the refrigerator, cutting boards, countertops and utensils that may have contacted contaminated foods; then sanitizing them with a solution of one tablespoon of chlorine bleach to one gallon of hot water; and drying them with a clean cloth or paper towel that has not been previously used.
- Wiping up spills in the refrigerator immediately and cleaning the refrigerator regularly.
- Washing your hands with warm water and soap for at least 20 seconds before and after handling food and following any cleaning and sanitation process.
Separate from the FDA’s investigation into the ongoing listeriosis outbreak, on June 30, A&M Farms of Lyons, Georgia voluntarily recalled some of its whole Vidalia onions, sold under the brand name Little Bear, citing potential contamination with L. monocytogenes, the FDA reported (opens in new tab). Again, Little Bear onions have not yet been linked to the ongoing outbreak, and so far, no illnesses or adverse events have been reported in connection to the onions.
Originally published on Live Science.
Nicoletta Lanese is a staff writer for Live Science covering health and medicine, along with an assortment of biology, animal, environment and climate stories. She holds degrees in neuroscience and dance from the University of Florida and a graduate certificate in science communication from the University of California, Santa Cruz. Her work has appeared in The Scientist Magazine, Science News, The San Jose Mercury News and Mongabay, among other outlets.
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