how long does it take to test for influenza?
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Samples should be collected within the first 3-4 days of illness. Rapid influenza diagnostic tests (RIDTs) provide results within approximately 15 minutes; viral culture provides results in 3-10 days.
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What You Should Know - Influenza Exposure Within Past 7 Days: Although you were exposed to flu, you do not have any symptoms (such as cough or fever). Symptoms usually start within 1 to 4 days of close contact with another person with flu.
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Dr. Clements: When you get infected with the flu virus, it multiplies quietly in body until you get symptoms of the disease and start excreting enough virus to give to someone else. That's the incubation period. For the flu, it is about two to five days.
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Adults are most contagious with the flu from 24 hours before symptoms start to three to five days afterward. Children can spread the virus for longer—up to 10 days, and sometimes even beyond that. People who have serious immune system problems can spread influenza for weeks, or even months, after they get it.
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An infected person can spread the flu for five to seven days after becoming infected. The infectious period can begin 24 hours before the onset of symptoms. This means you can spread the flu without even knowing you're sick.
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For most tests, it only takes about 5 to 10 minutes for a result to appear. Typically, a colored line or plus symbol will appear on the test stick to indicate a positive result. The absence of a colored line or a negative sign usually indicates a negative result.
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Uncomplicated influenza signs and symptoms typically resolve after 3-7 days for the majority of people, although cough and malaise can persist for >2 weeks, especially in elderly people and those with chronic lung disease.
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The average incubation period for the flu is two days . This means that, on average, people start to develop flu symptoms about two days after coming into contact with the influenza virus. Several things can influence how long the incubation period is for the flu, including: Infectious dose.
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Test results may be available within 3 weeks. However, it may take longer during the summer when arbovirus (viruses spread by bites of mosquitos and ticks) activity is high.
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Incubation period of influenza virus The incubation period is 1–4 days, with an average of 2 days for seasonal influenza.
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In the United States routine influenza vaccination is recommended for all persons aged 6 months and over. It takes up to two weeks after vaccination for sufficient antibodies to develop in the body.
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It may take one to four days after exposure to the influenza virus for symptoms to develop. If you have the flu, you'll be contagious one day before developing symptoms and up to five to seven days after becoming ill.
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Symptoms usually start within 1 to 4 days of close contact with another person with flu. Seven days is an outer limit. Since 7 days have passed, you should be safe and not get the flu from this exposure.
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Antiviral drugs work best when taken within 48 hours of onset of flu symptoms, but they may still offer benefits when taken later. These medications may reduce the duration of flu by one to two days and prevent severe flu complications.
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Does flu vaccine work right away? No. It takes about two weeks after vaccination for antibodies to develop in the body and provide protection against influenza virus infection. That's why it's best to get vaccinated before influenza viruses start to spread in your community.
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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.
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How long does the flu last? Certain flu symptoms tend to last longer than others. The fever typically resolves in two to three days but can last as long as a week or more. The sore throat often gets worse even while the rest of the symptoms resolve, and can easily last a week or longer.