Mononucleosis is one of the infectious diseases that affect humans. Mononucleosis usually does not result in serious complications, but on the other hand, the symptoms of mononucleosis can be really severe: people suffering from it may complain, for example, of a sore throat that makes swallowing very difficult. For this reason, some people wonder how to protect themselves from infection - so how can mononucleosis be contracted and for how long can a person with mononucleosis infect other people?