Which test could detect Corona virus earliest if a person is exposed to a positive case ?

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Infection with the virus causing COVID-19 (SARS-CoV-2) is confirmed by the presence of viral RNA detected by molecular testing, usually RT-PCR. Detection of viral RNA does not necessarily mean that a person is infectious and able to transmit the virus to another person.

IgG igM antigen rapid card test will give you indication earliest in 15 mts But confirmatory is swab for RT pcr

Sir IgM become positive only after 4-5 days

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The COVID-19 RT-PCR test is a real-time reverse transcription polymerase chain reaction (rRT-PCR) test for the qualitative detection of nucleic acid from SARS-CoV-2 in upper and lower respiratory specimens (such as nasopharyngeal or oropharyngeal swabs, sputum, lower respiratory tract aspirates, bronchoalveolar lavage, ...

To do rtpcr..sometimes it can be false NEGATIVE . Hence do repeat swab after 3 days if symptoms are suggestive of covid.. get isolated meanwhile..do IgM antibody test on day 7

Antigen test for sarscov2 igg igm but later on confirm with RT PCR

IgM takes 4-5 days to develop

IgG igM antigen but confirm by rt pcr

Sars cov2 igg

Rt pcr

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