If I have a fever from mono, could I still go to class safely?
It is not unusual to run low grade fevers (under 100.5 degrees F) with mononucleosis, sometimes for two weeks or more, so as long as you are staying well hydrated and resting as much as possible, you can usually stay in school. There are physical restrictions that are necessary, such as no contact sports, to protect your enlarged liver and spleen as you are fighting the virus.
Higher fevers over 100.5 degrees F are debilitating so my recommendation is to rest and hydrate at home and not go to class.
Of course anyone with a mono diagnosis needs to protect others from contact with saliva--no sharing toothbrushes, utensils, drinks, hookah pipes, or for that matter, lips and mouth.