Symptoms of measles, mumps, and rubella include fever, rash, and swollen glands. Measles, Mumps, and Rubella (MMR) screening checks immunity to these contagious diseases, crucial for schools, healthcare workers, and travel. A blood test detects antibodies against the viruses, guiding medical decisions like vaccinations. Prompt MMR screening safeguards personal and public health, preventing infection spread and outbreaks effectively.