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Yersinia enterocolitica. This is the most common cause of mesenteric lymphadenitis in children. This bacterium can cause gastroenteritis and other problems. Itmay "look like" other conditions. Two examples are Crohn's disease and acute appendicitis.
Other infections that cause mesenteric lymphadenitis include:
Direct or indirect infections related to HIV. This is the virus that can lead to AIDS.
Tuberculosis. This is a common bacterial infection. It usually attacks the lungs. But it can also attack other parts of the body.