What condition might a client develop if they do not receive prompt treatment for influenza?

If a client does not receive prompt treatment for influenza, they may develop pneumonia, which is a serious complication associated with the virus. Influenza can weaken the immune system and increase susceptibility to bacterial infections in the lungs. When the influenza virus causes inflammation in the respiratory tract, it creates an environment where bacteria can thrive, potentially leading to pneumonia. This condition is characterized by symptoms such as cough, fever, and difficulty breathing, and it requires more extensive medical intervention compared to the initial flu symptoms. Initiating treatment early can help mitigate these risks and prevent the progression from influenza to more severe respiratory complications like pneumonia. Other conditions listed, such as cough, headache, and nasal congestion, are typically associated with the flu itself and do not signify a more serious progression like pneumonia does.