Given the task definition and input, reply with output. Given a passage and a query based on the passage, generate an unambiguous, concise and simple answer to the query from information in the passage. Note that the answer may not be present in exact form.

These assays can yield results in approximately 1-8 hours depending upon the assay. Notably, the detection of influenza viral RNA by these assays does not necessarily indicate detection of viable infectious virus or on-going influenza viral replication. It is important to note that not all assays have been cleared by the FDA for diagnostic use. The signs and symptoms of influenza can vary by age, immune status, and presence of underlying medication conditions. Uncomplicated influenza can include any or all of these signs and symptoms: fever, muscle aches, headache, lack of energy, dry cough, sore throat, nasal congestion, and possibly runny nose. Dr. Robert Vanzant used the quick test for flu in January and February, but he never expected to bring it out again as we head into summer. This is not flu season, so if someone has the flu this time of year we have to consider swine flu, said Dr. Van Zant, a family practice physician. He demonstrated the flu quick test for us by sticking a cotton swab up both nostrils. Both sides and it's gonna tickle. I'm digging for china here, said Dr. Vanzant. After swabbing both nostrils, the swab sits in liquid for a minute, then the test strip goes in and results come back in 10 minutes. It's the same technology that's used for the home pregnancy test, said Dr. Vanzant. Our test is negative, but other tests are examples of what a positive test looks like. Among respiratory specimens for viral isolation or rapid detection of human influenza viruses, nasopharyngeal specimens typically have higher yield than nasal or throat swab specimens. As with any diagnostic test, results should be evaluated in the context of other clinical and epidemiologic information available to health care providers. Preferred respiratory samples for influenza testing include nasopharyngeal or nasal swab, and nasal wash or aspirate, depending on which kind of test is used . Rapid Influenza Testing. The diagnostic accuracy of influenza swabs is often overestimated by clinicians. The CDC notes that rapid influenza testing has a sensitivity ranging from approximately 50% to 70% meaning that in up to half of influenza cases, the flu swab results will still be negative. Another study in Turkey showed that the sensitivity of rapid influenza testing for H1N1 ranged from 31.7% to 50%, again depending on the brand of test. During a respiratory illness outbreak in a closed setting (e.g., hospitals, long-term care facility, cruise ship, boarding school, summer camp) testing for influenza can be very helpful in determining if influenza is the cause of the outbreak. So how sensitive are they for "flu-like illness"? Rapid Influenza Testing The diagnostic accuracy of influenza swabs is often overestimated by clinicians. The CDC notes that rapid influenza testing has a sensitivity ranging from approximately 50% to 70% meaning that in up to half of influenza cases, the flu swab results will still be negative. Preferred respiratory samples for influenza testing include nasopharyngeal or nasal swab, and nasal wash or aspirate, depending on which kind of test is used (see table(https://www.cdc.gov/flu/professionals/diagnosis/table-testing-methods.htm)). Samples should be collected within the first 3-4 days of illness. Laboratory Diagnostic Procedures. A number of tests can help in the diagnosis of influenza (see table(https://www.cdc.gov/flu/professionals/diagnosis/table-testing-methods.htm)). But, tests do not need to be done on all patients with suspected influenza. Rapid influenza diagnostic tests (RIDTs) provide results within approximately 15 minutes; viral culture provides results in 3-10 days. Most of the rapid influenza diagnostic tests that can be done in a physician's office are approximately 50-70% sensitive for detecting influenza and approximately greater than 90% specific. Query: how long does a flu swab take for results
A flu swab takes 10 minutes for results.