👉 Guilliermondella is a type of bacteria that causes diarrhea in infants and young children, often due to ingestion of contaminated milk or formula. It can also be found in older adults who are immunocompromised or have weakened immune systems. The bacteria primarily infect the small intestine and cause inflammation and dehydration. Symptoms may include diarrhea, vomiting, abdominal pain, fever, and weight loss. Treatment typically involves supportive care measures such as oral rehydration therapy to replenish fluids lost through diarrhea.