About 1,144,408 results (4,278 milliseconds)

Waning of vaccine effectiveness against moderate and severe covid ...

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Oct 3, 2022 ... ... test result but no diagnoses or symptoms suggesting covid-19 illness. ... could have had positive test results for other respiratory ...

Vaccine effectiveness of two-dose BNT162b2 against symptomatic ...

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Aug 8, 2022 ... Individuals could have more than one test, and if an adolescent presented multiple negative ... The primary outcome was COVID-19 symptomatic ...

Illness duration and symptom profile in symptomatic UK school-aged ...

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Aug 3, 2021 ... It should be noted that PCR testing was only available for symptomatic ... The symptom burden in children testing negative for SARS-CoV-2 but ...

Covid: Lateral flow tests more accurate than first thought, study finds

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Oct 14, 2021 ... 'Isolate if you have symptoms but test negative' · Is mass use of rapid tests a good idea? · Who can still get free Covid tests? · Covid cases fell ...

Little-known illness turning up in COVID long-haulers | PBS News

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Jun 1, 2021 ... Four months later she tested negative for the virus, but her symptoms have only worsened. Dawson is among what one doctor called “waves and ...

Effectiveness of rAd26-rAd5, ChAdOx1 nCoV-19, and BBIBP-CorV ...

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Mar 15, 2022 ... Because participants could have more than one RT-PCR test, each individual was ... Covid-19 vaccine effectiveness and the test-negative design. N ...

Biden Tests Negative for Covid and Will End Isolation - The New ...

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Jul 27, 2022 ... The president's symptoms are “almost completely resolved,” his physician said, but he will continue to wear a mask and test more frequently ...

COVID Testing FAQ, From Reinfection to Persistent Positives

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Jun 10, 2020 ... Many companies have in development new panels that incorporate the novel coronavirus, but they are not yet FDA-approved. SARS-CoV-2 PCR tests do ...

FDA Warns of False Negative COVID Tests From Virus Mutations

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Jan 8, 2021 ... ... test. The risk that these mutations will affect overall testing accuracy is low, but the FDA is taking additional actions to ensure ...

Vaccinated Canadians can have COVID-19 symptoms despite ...

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Apr 8, 2022 ... Experts say a person may test negative for COVID-19 on a rapid antigen test despite being infected, partly due to how quickly vaccination ...

Vaccine effectiveness of primary series and booster doses against ...

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Oct 11, 2022 ... Enrolled participants reported never having symptoms of covid-19 ... test negative design should be considered.1945 These limitations ...