The nurse is caring for a client with influenza. Which system should the nurse assess first?

Choice A reason: Influenza is an acute viral illness that primarily affects the respiratory system. Complications such as pneumonia, hypoxia, and respiratory distress are common and can become life-threatening if not identified promptly. According to priority principles, airway and breathing take precedence, making respiratory assessment the nurse’s first priority. Choice B reason: Neurological assessment may be necessary if the client shows signs of altered mental status or complications such as encephalopathy. However, neurological involvement is not the primary or most immediate concern in uncomplicated influenza, so it does not take priority over respiratory assessment. Choice C reason: The endocrine system is not directly impacted in the acute phase of influenza. While systemic illness can affect metabolic demands, endocrine assessment is not urgent compared to respiratory function in this condition. Choice D reason: Cardiovascular assessment is important for overall monitoring, especially in older adults or those with comorbidities. However, influenza most commonly compromises oxygenation and ventilation first, so respiratory assessment remains the highest priority.