Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
Read more health news
Measles is diagnosed when Koplik's spots are seen. A blood test, known as an antibody titer, can also detect the measles virus. Antibodies appear within 3 days after the rash begins.