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This disease is most contagious during its acute stage. This is when the affected person still has a fever.

Someone with mononucleosis does not need to be kept isolated from others. However, many doctors recommend that the patient avoid kissing others while he or she is feeling ill. This helps to help prevent the spread of the infection.

Some authorities also advise avoiding sharing food, drinks or eating utensils during the first few weeks of the illness.

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