The early symptoms of mononucleosis resemble those of the flu, including:
Sore throat, which sometimes can be very severe
Chills, followed by a fever
After a day or two, these additional symptoms of mono may occur:
Swollen lymph nodes.
Jaundice (a yellow tinge to the skin and eyes).
A measles-like skin rash anywhere on the face or body; sometimes the rash develops suddenly after taking amoxicillin for a severe sore throat...