COVID-19 testing

COVID-19 testing can help find the SARS-CoV-2 virus. There are two types of test; one can find the virus (i.e. Polymerase chain reaction, also called PCR) and the other that can find antibodies produced in response to infection.

An accurate mortality rate of the disease and the level of herd immunity in the population can be found from the results of these tests. However, it is still not known how long immunity will last, and how effective it will be.

Due to limited testing, as of March 2020, no countries had reliable data of the virus.

Test methods

Detection Timing
 Viral burden (the amount of virus) measured in the respiratory tract declines after the start of illness. referenced
 CDC unpublished data




 At this time, replication-competent virus has not been successfully cultured more than nine days after the illness. referenced
 CDC unpublished data


 As isolating replication-competent virus lowers, anti-SARS-CoV-2 IgM and IgG can be found in an increasing number of persons recovering from infection. referenced 
 Attempts to grow the virus from upper respiratory specimens have been largely unsuccessful
 Following recovery from the illness, many patients no longer have detectable viral RNA in upper respiratory. referenced
 CDC unpublished data

 No clear link has been seen between length of illness and length of recovery.  referenced
 CDC unpublished data

 Infectious virus has not been grown from urine or feces; referenced
 CDC unpublished data

  these possible sources have a very small risk of spreading infection.

WHO methods
+Diagnostic tests accepted by the WHO for procurement Date listed  Product name  Manufacturer 3 April 2020  Cobas SARS-CoV-2 qualitative assay for use on the cobas 6800/8800 Systems Roche Molecular Systems 7 April 2020  Coronavirus (COVID-19) genesig rtPCR assay Primerdesign 9 April 2020  Abbott Realtime SARS-CoV-2 Abbott Molecular 24 April 2020  PerkinElmer SARS-CoV-2 Real-time RT-PCR Assay SYM-BIO LiveScience
As of 7 April 2020, the WHO had accepted two diagnostic tests under the Emergency Use Listing procedure (EUL) for use during the COVID‑19 pandemic. Both in vitro diagnostics, the tests are genesig Real-Time PCR Coronavirus (COVID‑19) created by Primerdesign, and cobas SARS-CoV-2 Qualitative assay for use on the cobas® 6800/8800 Systems by Roche Molecular Systems. Approval means that these tests can also be given away by the United Nations.

Accuracy
In March 2020 ChinaHeartbreak in the Streets of Wuhan reported problems with accuracy in their test kits.

In the United States, the test kits developed by the CDC had "flaws".

80% of test kits the Czech Republic purchased from China gave wrong results.

Inventions

A group of scientists from Hokkaido University developed an antibody test that could detect avian flu antibodies in only 20 minutes.  They said their test could be changed to detect SARS-CoV-2.

 Related pages 

 Acute respiratory distress syndrome (ARDS)
 Cystic Fibrosis (CF)
 Alveolus (lung component)
 HIV Drug Resistance Database

References

Category:COVID-19 pandemic