WebMD Medical News
Daniel J. DeNoon
Laura J. Martin, MD
Oct. 4, 2011 -- Eighteen people now are confirmed dead in the ongoing listeria outbreak from contaminated cantaloupes.
The CDC confirms that 100 people in 20 states have been infected with one of the four outbreak strains of Listeria monocytogenes.
Listeria frequently causes miscarriage, stillbirth, or preterm birth when it infects a pregnant woman. Two pregnant women have been infected in the current outbreak. The CDC reports that "the outcome of each pregnancy is being monitored."
The contaminated cantaloupes came from Jensen Farms in Holly, Colo. All of these cantaloupes were recalled on Sept. 14. All were shipped by Sept. 10. Since cantaloupes have a shelf life of about two weeks, few if any of the melons are still being eaten.
But listeria can take up to two months to cause serious illness -- and it takes longer for these illnesses to be reported. The CDC notes that illnesses beginning after Sept. 7 may not yet be reported. That means the case count, and death toll, is likely to rise even further.
There have been five deaths in Colorado, two in Kansas, one in Maryland, one in Missouri, one in Nebraska, five in New Mexico, one in Oklahoma, and two in Texas.
The states reporting cases are:
Nearly all people infected in the outbreak have been hospitalized. Most illnesses are in people over age 60. The ages of those sickened in the outbreak range from 35 to 96 with a median age of 79.
Cantaloupes that are known not to come from Jensen Farms are safe to eat.
According to the CDC, people who have eaten listeria-contaminated cantaloupes (or other foods) do not need to seek medical attention unless they have symptoms.
The disease caused by listeria bacteria is called listeriosis. Although listeriosis is a food-borne illness, when you have symptoms of the disease it usually means the bacteria have escaped the digestive tract and are spreading throughout the body. Listeriosis often results in fatal meningitis or encephalitis.
Listeriosis usually begins with diarrhea or other intestinal symptoms. Patients soon develop fever and muscle aches. What happens next depends on a person's risk factors:
Foods typically linked to listeriosis are deli meats, hot dogs, and soft cheeses made with unpasteurized milk. Produce is less often linked to outbreaks, although listeria is found in soil and water. Listeria is killed by cooking, but it can grow and multiply in refrigerators.
The CDC has issued this advice:
As other foods besides cantaloupes can carry listeria, the CDC recommends these general steps to avoid listeriosis:
For more information, see WebMD's listeria FAQ.
What's it like to have listeriosis? See WebMD's account of a recent listeriosis case history.
SOURCES:CDC web site.FDA web site.
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