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Myocarditis - pediatric

Pediatric myocarditis is inflammation of the heart muscle in an infant or young child.

Causes
Myocarditis is rare in young children. It is slightly more common in older children and adults. It is often worse in newborns and young infants than in children over age 2.

Most cases in children are caused by a virus that reaches the heart. These can include:

Influenza (flu) virus
Coxsackie virus
Parovirus
Adenovirus
It may also be caused by bacterial infections such as Lyme disease.

Other causes of pediatric myocarditis include:

Allergic reactions to certain medicines
Exposure to chemicals in the environment
Infections due to fungus or parasites
Radiation
Some diseases (autoimmune disorders) that cause inflammation throughout the body
Some drugs
The heart muscle may be directly damaged by the virus or the bacteria that infect it. The body's immune response can also damage the heart muscle (called the myocardium) in the process of fighting the infection. This can lead to symptoms of heart failure.

https://medlineplus.gov/ency/article/007307.htm