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 You are the medical officer of a PHC in Kerala and you confirm the diagnosis of polio in one of your patients. This can be considered as: and explain in detail?
Here this disease is an unusual occurrence in the community and is clearly in excess of the expected frequency. So even a single case of polio is an epidemic as per definition. A sporadic case means the case occurs irregularly, haphazardly from time to time and generally infrequent. Ref: Park, Edition 21, Page - 89