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 What is the first case of a paicular condition that comes to notice of a physician termed as? and explain in detail?
Index case is the first case that comes to the attention of the investigator. Case is defined as a person in the population or study group identified as having the paicular disease, health disorder or condition under investigation. - Primary case: It is the first case of a communicable disease introduced into the population unit being studied. - Secondary case: are those developing from contact with a primary case.