Usually rats spread many diseases and parasites, and if a person mistakenly eats food contaminated with rat excrement or directly with saliva, they can develop plague, typhus, typhoid fever, epidemic hemorrhagic fever, etc. There will also be some degree of digestive system symptoms, such as nausea, vomiting, abdominal pain, diarrhea, blood in the stool, or typical high fever. If that clinical symptom occurs and it is obvious that you have eaten something eaten by rats, you need to go to the infectious disease department of the hospital to avoid delaying the disease.