Rare but potentially fatal
Most common cause of heart failure in previously healthy children, also one of the etiologies for unexpected sudden cardiac death in infants
Inflammation of myocardium
Can lead to dilated cardiomyopathy
Typically viral but often no pathogen identified. Other causes include bacterial, toxins, and autoimmune causes
Can lead to dilated cardiomyopathy
Myocarditis 
Airway obstruction
Endocarditis
Anaphylaxis
Constrictive pericarditis
Angioedema
Pericarditis
Aspirated foreign body