What Is the Kissing Disease in Babies & How Is It Different From Mono?

Babies are so sweet and cute that it’s hard to not want to smother them with kisses. But could all that affection actually be dangerous for a baby? While we know that lots of viruses can be shared through close contact, especially if you end up sharing saliva, can babies actually get “the kissing disease,” otherwise known as mononucleosis or mono? The answer is yes, but there may be some surprisingly good news about the risks of mono for babies and toddlers. Read on for the full scoop on babies and the kissing disease.

What is mono?

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Mononucleosis is an illness, often caused by the Epstein-Barr virus, that most commonly afflicts adolescents and young adults, who are also the most likely to have more serious cases. Mono is spread through saliva, hence the nickname “the kissing disease,” and can be present in the saliva of an infected person for months after the infection. There is currently no vaccine that prevents mono. Mono can be prevented by not sharing toothbrushes, drinking glasses, silverware, or other objects that might come in contact with saliva. For very young children, this would include pacifiers, teethers, or other toys that might get slobbered on.

Symptoms of mono

While mono is more difficult to catch than a common cold or flu, it mimics some of the same symptoms and does require a doctor’s diagnosis. There are multiple signs and symptoms of mono, including fatigue, sore throat, fever, swollen lymph nodes, headaches, rashes, and swollen tonsils. One of the hallmarks of mono is that it can last for weeks, with mild cases resolved in two to four weeks and more serious cases lasting up to six months.

In rare cases, mono can cause serious symptoms, like liver problems, including hepatitis or jaundice, an enlarged spleen, or anemia.

Mono and young children

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The good news about mono and babies is that while babies can catch it, they seem to have cases that are much milder. According to Dr. Eric Morley, a pediatrician with the Memorial Care Group, babies can catch mono as it “is transmitted through saliva, so if someone with the virus kisses a baby on the mouth, or shares spoons, forks, cups — or anything else their lips have touched — with a baby, then the virus can be spread. While babies can have sore throat, fever, and swollen glands, just like teenagers, in general their symptoms tend to be much less severe and look more like the flu. They may even have no noticeable symptoms at all.”

If your baby does have mono, the best treatment is rest, fluids, and treatment of symptoms as advised by your doctor.

Some young children may have mono without it being detected, which is actually great news, as it means they will be unlikely to contract mono later in life, when symptoms might be more severe.

Ways to prevent mono

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Researchers aren’t totally sure how long someone with mono is contagious. It can take four to six weeks from first exposure to the onset of mono symptoms. The best way to prevent mono is to practice good cleaning habits if someone with any illness symptoms comes into your home, and to try to prevent your baby from sharing saliva though toys, pacifiers — and yes, kissing. Short of putting baby into a bubble, it may not be possible to prevent exposure, but at least the odds are good that their case will be mild if it happens.