how long is someone contagious with mono
Symptoms may last 2 to 4 weeks, and some people feel tired for several weeks longer (that's why it's important to take care of yourself and get lots of rest). Doctors and researchers aren't exactly sure how long people with mono stay contagious after symptoms are gone. They believe that people can spread the infection for many months after their symptoms are completely gone â some studies show as long as 18 months. After that, the virus remains dormant (inactive) in the body for the rest of a person's life. If you've had mono, the virus can find its way into your saliva at times.