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most doctors and researchers only know this about Listeria....

The infection caused by Listeria can vary from mild to severe

When a person is infected and develops symptoms of Listeria infection, the resulting illness is called listeriosis. [4, 11, 18] Only a small percentage of persons who ingest Listeria fall ill or develop symptoms. [18] For those who do develop symptoms as a result of their infection, the resulting illness is either mild or quite severe, in what is sometimes referred to as a “bimodal distribution of severity.” [13, 28]


On the mild end of the spectrum, listeriosis usually consists of the sudden onset of fever, chills, severe headache, vomiting, and other influenza-type symptoms. [18, 28] Along these same lines, the CDC notes that infected individuals may develop fever, muscle aches, and sometimes gastrointestinal symptoms such as nausea or diarrhea. [11] When present, the diarrhea usually lasts 1-4 days (with 42 hours being average), with 12 bowel movements per day at its worst. [18]

Most healthy adults and children who consume contaminated food experience only mild to moderate symptoms. The infection is usually self-limited, since, in healthy hosts, exposure to Listeria stimulates the production of tumour necrosis factor and other cytokines, which activate monocytes and macrophages to eradicate the organism. Few people with normal immune function go on to have more severe, life-threatening forms of listeriosis, characterized by septic shock, meningitis and encephalitis. [4]