You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Endemic Disease means that a disease - and explain in detail?
Endemic refers to the constant presence of a disease or infectious agent within a given geographic area or population groups, without impoation from outside Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 101