The most common cause of chronic lymph node enlargement at a localized body site in young children is

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Cat scratch fever, also known as cat scratch disease, is the most common cause of chronic lymph node enlargement in young children. It is caused by the bacteria Bartonella henselae, which is spread through scratches or bites from infected cats. Rat bite fever, dead bat fever, and mouse itch fever are all rare infections that are unlikely to be the cause of chronic lymph node enlargement in young children.

The Most Common Cause of Chronic Lymph Node Enlargement at a Localized