It's viral: Neat experiments showed that most people had acute ebstein-barr infections (the offical name for mono) by the time they're 4 years old. So the few who don't, get mono later. Mono virus sometimes causes "clinical" infections - ones that have symptoms, and sometimes result in "subclinical" infections that don't have any obvious symptoms. Both kinds can lead to immunity so you don't get it again.
Answered 9/28/2016
6.3k views
Mono: Everyone is different. Some people get cancer while others don't. Some people get more severe colds than other people.
Answered 2/13/2014
4.9k views
2 doctors weighed in across 2 answers
2 doctors weighed in across 2 answers
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