There are no commercials for mononucleosis. All the people who answered "mono" are actually WRONG.The commercial you saw was for Menactra, the vaccine that protects against meningococcal meningitis. Here is the ad you were asking about
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http://www.menactra.com/what_is_mena...lMeningococcus spreads by swapping spit and sharing drinks and cigarettes. It is highly contagious.Meningococcus causes swelling of the brainstem and spinal cord membranes. It can also cause toxic sepsis that can kill an otherwise healthy teenager within HOURS of symptom onset. Stories often go like, "He was running a high fever, so he went to bed early. but when we checked on him the next morning, he was dead and had these purple spots on his body."Meningococcus kills many college students in the US each year. Those who survive often lose arms and legs from the damage from the sepsis.Symptoms include headache, fever, fatigue, sensitivity to light and stiff neck.