Which condition is listed among the causes of unilateral cervical lymphadenopathy?

Unilateral cervical lymphadenopathy is commonly associated with several infectious and non-infectious causes, but Cat Scratch Disease is one of the well-known causes. This condition is caused by Bartonella henselae, a bacterium transmitted through scratches or bites from infected cats. The hallmark of Cat Scratch Disease is the development of a painful lymphadenopathy, often in the region where the scratch occurred, typically presenting as unilateral swelling of the cervical lymph nodes.

This association is particularly significant because, in the pediatric population, Cat Scratch Disease frequently leads to lymph node enlargement on one side of the neck. The fever and accompanying symptoms may vary, but the distinctive presentation of lymphadenopathy helps in diagnosing the condition.

In contrast, the other options do not have a strong direct connection with unilateral cervical lymphadenopathy. Acute appendicitis primarily presents with abdominal pain, asthma is a respiratory condition, and influenza also does not typically cause local lymph node enlargement in the cervical region. Therefore, Cat Scratch Disease stands out as a distinct cause of unilateral cervical lymphadenopathy, making it the correct answer to this question.