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 Fundoscopic examination of a child shows salt and pepper appearance. He probably has: and explain in detail?
Differential diagnosis of salt and pepper appearance of fundus: Prenatal rubella Prenatal influenza Varicella Mumps Congenital syphilis Ref: Comprehensive Ophthalmology by AK Khurana, 4th edition, Page 495.