Yersinia enterocolitica, a Gram-negative coccobacillus, is an important pathogen [1] [2]. This bacterial microorganism causes infections all over the world, both sporadically and in the form of outbreaks [1] [2] [3]. Pigs are established as the main reservoir of Yersinia enterocolitica and unprocessed, raw, or undercooked pork meat are regarded as the primary source of infection, while contaminated water sources are also described in the pathogenesis [1] [2] [4] [5] [6]. Furthermore, cattle, goats, sheep, wild boars, cats, dogs, and small rodents are also identified as reservoirs of Yersinia enterocolitica [7]. Several outbreaks were attributed to the consumption of contaminated dairy products and tofu cheese [1] [6]. Gastroenteritis is the hallmark of Yersinia enterocolitica infection and is primarily encountered in infants and children under 10 years of age [1] [2] [3] [6] [8]. The spectrum of manifestations ranges from a benign and self-limiting abdominal discomfort to severe right lower quadrant abdominal pain (often mimicking appendicitis), tenesmus, vomiting, fever, and watery or bloody diarrhea [2] [3] [6] [7] [8] [9]. The symptoms are typically present for 7-14 days, but complications of Yersinia enterocolitica infection may be glomerulonephritis, myocarditis, reactive arthritis, and erythema nodosum [3] [6], whereas sepsis and extraintestinal dissemination of the infection are seen in rare cases [2] [3]. The presence of cirrhosis, malignancies, diabetes mellitus, and iron overload is associated with an increased risk for a systemic infection [2] [3] [8].

With a properly obtained patient history and a detailed physical examination, a presumptive diagnosis of Yersinia enterocolitica infection can be made. During the interview, the physician should assess whether the patient recently consumed undercooked or unprocessed pork or dairy products, whereas the presence of bloody stools may narrow the list of causative agents responsible for the infection. To confirm Yersinia enterocolitica as the culprit, microbiological studies need to be used. One of the first and most important investigations are stool cultures (although blood, peritoneal fluid, throat swabs, and excised mesenteric lymph nodes might also be used for cultivation) but their long turnaround time mandates the use of other methods, such as serologic and molecular studies [3] [6]. Enzyme-linked immunosorbent assay (ELISA), mainly used in the setting of chronic infections, is a reliable serologic study that can detect IgA, IgM or IgG antibodies, while polymerase chain reaction (PCR) is now regarded as an optimal procedure, being able to provide results within a very short time span [3] [6].

Treatment for Yersinia enterocolitica infection often depends on the severity of the symptoms:

• Mild Cases: Often resolve on their own without specific treatment. Supportive care, such as staying hydrated and resting, is usually sufficient.
• Severe Cases: May require antibiotics, especially if the infection has spread beyond the intestines or if the patient is immunocompromised.
• Symptomatic Relief: Over-the-counter medications may be used to manage symptoms like fever and pain.

The prognosis for Yersinia enterocolitica infection is generally good, especially in otherwise healthy individuals. Most people recover fully within a few weeks without any long-term effects. However, complications can occur, particularly in those with weakened immune systems or underlying health conditions. These complications may include reactive arthritis or skin rashes, which can persist even after the infection has cleared.

Yersinia enterocolitica is a bacterium that belongs to the family Enterobacteriaceae. It is primarily transmitted through the consumption of contaminated food or water. The most common sources include:

• Undercooked Pork: Particularly chitterlings (pork intestines).
• Unpasteurized Milk: Can also be a source of infection.
• Contaminated Water: Drinking or using contaminated water can lead to infection.

Yersinia enterocolitica infections are more common in certain regions, particularly in cooler climates. The infection is more frequently reported in children, with the highest incidence in those under five years of age. Outbreaks can occur, often linked to contaminated food products. The incidence of yersiniosis varies globally, with higher rates reported in Europe and Japan compared to the United States.

Once ingested, Yersinia enterocolitica bacteria invade the lining of the intestines, leading to inflammation and the symptoms associated with the infection. The bacteria can also spread to other parts of the body, such as the lymph nodes, causing additional symptoms and complications. The body's immune response to the infection can sometimes lead to post-infectious complications like reactive arthritis.

Preventing Yersinia enterocolitica infection involves several key practices:

• Proper Food Handling: Cook pork products thoroughly and avoid cross-contamination with other foods.
• Safe Water Consumption: Drink only treated or boiled water, especially in areas where the water supply may be contaminated.
• Hygiene: Wash hands thoroughly with soap and water, particularly after handling raw meat or using the bathroom.

Yersinia enterocolitica infection is a bacterial illness that primarily affects the intestines, causing symptoms like diarrhea, abdominal pain, and fever. It is most commonly contracted through contaminated food or water, with undercooked pork being a significant source. While most cases resolve without treatment, severe infections may require antibiotics. Preventive measures, such as proper food handling and hygiene, are crucial in reducing the risk of infection.

If you suspect you have a Yersinia enterocolitica infection, it is important to monitor your symptoms and maintain hydration. Most infections are mild and resolve on their own, but if symptoms persist or worsen, medical evaluation may be necessary. Practicing good hygiene and ensuring food is cooked thoroughly can help prevent future infections.

1. Huovinen E, Sihvonen LM, Virtanen MJ, Haukka K, Siitonen A, Kuusi M. Symptoms and sources of Yersinia enterocolitica-infection: a case-control study. BMC Infect Dis. 2010;10:122.
2. Bottone EJ. Yersinia enterocolitica: the charisma continues. Clin Microbiol Rev. 1997;10(2):257–276.
3. Fredriksson-Ahomaa M, Stolle A, Korkeala H. Molecular epidemiology of Yersinia enterocolitica infections. FEMS Immunol Med Microbiol. 2006;47(3):315-329.
4. Fredriksson-Ahomaa M, Stolle A, Siitonen A, Korkeala H. Sporadic human Yersinia enterocolitica infections caused by bioserotype 4/O:3 originate mainly from pigs. J Med Microbiol. 2006;55:747–749.
5. Ostroff SM, Kapperud G, Hutwagner LC, et al. Sources of sporadic Yersinia enterocolitica infections in Norway: a prospective case-control study. Epidemiol Infect. 1994;112(1):133–141.
6. Bancerz-Kisiel A, Szweda W. Yersiniosis - a zoonotic foodborne disease of relevance to public health. Ann Agric Environ Med. 2015;22(3):397-402.
7. Rosner BM, Stark K, Werber D. Epidemiology of reported Yersinia enterocolitica infections in Germany, 2001-2008. BMC Public Health. 2010;10:337.
8. Le Guern AS, Martin L, Savin C, Carniel E. Yersiniosis in France: overview and potential sources of infection. Int J Infect Dis. 2016;46:1-7.
9. Chakraborty A, Komatsu K, Roberts M, et al. The Descriptive Epidemiology of Yersiniosis: A Multistate Study, 2005–2011. Public Health Rep. 2015;130(3):269-277.