2. Crohn's Disease : Causes and symptoms
The cause of Crohn's disease is unknown. No infectious agent (virus, bacteria, or fungi) has been identified as the cause of Crohn's disease. Still, some researchers have theorized that some type of infection may have originally been responsible f...
Healthline.com (OMS Preferred Provider)

3. Crohn's Disease | Causes, Symptoms, Treatment | PDRHealth
Patients must seek help if they become extremely sick with fever, vomiting, dehydration, or severe debility. Severe attacks of Crohn's disease put patients at risk of losing too much blood, or more fluid and nutrients than they can make up through...
pdrhealth.com