For How Long Is Mononucleosis Contagious?

People are definitely contagious while they have symptoms, which can last 2–4 weeks or even longer. Health experts aren't sure how long people with mono stay contagious after symptoms are gone, but it seems they can spread the infection for months after that.

When can I kiss after mono?

This is a difficult question to answer. It is advisable to at least refrain from kissing while there are active symptoms present (i.e. sore throat, fever, swollen glands). Mono may be contracted from carriers (someone who has the organism causing the disease, but who does not become ill).

When does mono stop being contagious?

Once your symptoms do appear, they may last for two to four weeks. You can pass the virus to other people through your saliva for up to three months after your symptoms subside. Some studies have reported that you may still be contagious for up to 18 months.