Which medical condition excludes a child from participating in sports?

A current fever is a valid reason for a child to be excluded from participating in sports. When a child has a fever, it typically indicates an underlying infection or illness that can compromise their immune system and overall health. Participating in sports during this time could not only worsen their condition but also pose a risk of spreading infections to teammates and other participants. Additionally, a fever can lead to dehydration and fatigue, making physical exertion unsafe.

In contrast, a history of HIV infection, persistent asthma, and a known seizure disorder can be managed with appropriate medical oversight. Children with these conditions can often participate in sports as long as they are stable and have received medical clearance. Therefore, the presence of a current fever is a clear and immediate reason to exclude a child from sports activities to ensure their safety and the health of others.