Medical providers can diagnose RSV through a physical exam and tests. The doctor may listen to the lungs for wheezing or other abnormal sounds. If this examination is inconclusive, they may order blood tests, chest x-rays, or analyze a sample of fluid from the nose. Blood tests show viruses or bacteria through white cell counts, and chest x-rays show any inflammation of the lungs.
Rapid RSV antigen tests are the most common test for RSV. Polymerase chain reaction (PCR) tests are typically recommended for older children and adults.

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