The doctor will do the following tests to diagnose a respiratory infection.
Respiratory Exam. Your doctor will check your breathing. He or she will also use stethoscope to listen to the abnormal sounds of your lungs when you breathe, to check fluid or inflammation. The doctor may peer into your nose and ears, and check your throat. If your doctor believes that the infection is in the lower respiratory tract, additional tests will be done.
X-ray or CT scan. Doctors will suggest these tests to see images of your lungs. They can help check your lung condition and possible infections.
Lung function tests. These are powerful tools to test your lungs. An example of this tool is pulse oximetry, which can check how much oxygen gets into the lungs.
Sputum sample. This test will check the type of virus or bacteria that is causing respiratory infection.
There is no known treatment for various viruses. To manage your signs and symptoms, doctors will prescribe medications and monitor your condition through weekly check ups. Antibiotics will be advised if bacterial infection is suspected.