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These signals are still active. Documentation is available on the [Quidel page](quidel.md).
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## Flu Tests
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***Earliest issue available:** April 29, 2020
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***Last issued:** May 19, 2020
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***Number of data revisions since May 19, 2020:** 0
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***Date of last change:** Never
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***Available for:** msa, state (see [geography coding docs](../covidcast_geography.md))
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***Time type:** day (see [date format docs](../covidcast_times.md))
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Data source based on flu lab tests, provided to us by Quidel, Inc. When a
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patient (whether at a doctor’s office, clinic, or hospital) has COVID-like
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symptoms, doctors may perform a flu test to rule out seasonal flu (influenza),
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because these two diseases have similar symptoms. Using this lab test data, we
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estimate the total number of flu tests per medical device (a measure of testing
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frequency), and the percentage of flu tests that are *negative* (since ruling
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out flu leaves open another cause---possibly covid---for the patient's
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symptoms), in a given location, on a given day.
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The number of flu tests conducted in individual counties can be quite small, so
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we do not report these signals at the county level.
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The flu test data is no longer updated as of May 19, 2020, as the number of flu
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tests conducted during the summer (outside of the normal flu season) is quite
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small. The data may be updated again when the Winter 2020 flu season begins.
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| Signal | Description |
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| --- | --- |
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|`raw_pct_negative`| The percentage of flu tests that are negative, suggesting the patient's illness has another cause, possibly COVID-19 <br/> **Earliest date available:** 2020-01-31 |
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|`smoothed_pct_negative`| Same as above, but smoothed in time <br/> **Earliest date available:** 2020-01-31 |
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|`raw_tests_per_device`| The average number of flu tests conducted by each testing device; measures volume of testing <br/> **Earliest date available:** 2020-01-31 |
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|`smoothed_tests_per_device`| Same as above, but smoothed in time <br/> **Earliest date available:** 2020-01-31 |
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no data is reported for that area on that day; an API query for all reported geographic areas on
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that day will not include it.
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## Flu Tests
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***Earliest issue available:** April 29, 2020
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***Last issued:** May 19, 2020
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***Number of data revisions since May 19, 2020:** 0
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***Date of last change:** Never
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***Available for:** msa, state (see [geography coding docs](../covidcast_geography.md))
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***Time type:** day (see [date format docs](../covidcast_times.md))
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Data source based on flu lab tests, provided to us by Quidel, Inc. When a
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patient (whether at a doctor’s office, clinic, or hospital) has COVID-like
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symptoms, doctors may perform a flu test to rule out seasonal flu (influenza),
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because these two diseases have similar symptoms. Using this lab test data, we
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estimate the total number of flu tests per medical device (a measure of testing
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frequency), and the percentage of flu tests that are *negative* (since ruling
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out flu leaves open another cause---possibly covid---for the patient's
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symptoms), in a given location, on a given day.
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The number of flu tests conducted in individual counties can be quite small, so
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we do not report these signals at the county level.
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The flu test data is no longer updated as of May 19, 2020, as the number of flu
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tests conducted during the summer (outside of the normal flu season) is quite
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small. The data may be updated again when the Winter 2020 flu season begins.
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| Signal | Description |
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| --- | --- |
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|`raw_pct_negative`| The percentage of flu tests that are negative, suggesting the patient's illness has another cause, possibly COVID-19 <br/> **Earliest date available:** 2020-01-31 |
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|`smoothed_pct_negative`| Same as above, but smoothed in time <br/> **Earliest date available:** 2020-01-31 |
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|`raw_tests_per_device`| The average number of flu tests conducted by each testing device; measures volume of testing <br/> **Earliest date available:** 2020-01-31 |
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|`smoothed_tests_per_device`| Same as above, but smoothed in time <br/> **Earliest date available:** 2020-01-31 |
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## Flu Tests (inactive)
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These signals were updated until May 19, 2020. Documentation is still available on the [inactive Quidel page](quidel-inactive.md).
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