Which admission order would raise concerns for a child with viral pneumonia?

The order for aspirin at a dose of 325 mg every 4 hours as needed for fever in a child with viral pneumonia raises significant concerns primarily due to the risk of Reye's syndrome. Reye's syndrome is a life-threatening condition that can occur in children who have viral infections, particularly influenza and chickenpox, if they are treated with aspirin. In the context of viral pneumonia, it is critical to avoid administering aspirin to children and instead use alternatives like acetaminophen for fever management.

Furthermore, the other admission orders listed are more appropriate for managing a child with viral pneumonia. Acetaminophen is safer for reducing fever, intravenous fluids can help maintain hydration, and bronchodilator therapy can assist if the child presents with wheezing. Thus, the use of aspirin in this case poses unnecessary health risks, making it the concerning choice for this scenario.