Listeriosis is a foodborne illness. It most commonly affects newborns, people with weakened immune systems, seniors, and pregnant women. Pregnant women are at particular risk of having listeriosis, as they are 20 times more likely to acquire the disease than other healthy adults.
Cases of listeriosis are usually infrequent, although there have been several known outbreaks in the past. Listeriosis is a rare disease but it is very serious since it is more likely to be fatal in severe cases, compared to other bacteria that cause food poisoning.