Serology tests are not recommended for identification of COVID-19 infections?
https://www.who.int/news-room/commentaries/detail/advice-on-the-use-of-point-of-care-immunodiagnostic-tests-for-covid-19
https://www.researchgate.net/deref/https%3A%2F%2Fwww.who.int%2Fnews-room%2Fcommentaries%2Fdetail%2Fadvice-on-the-use-of-point-of-care-immunodiagnostic-tests-for-covid-19
Hi Dear
Because it depend on the level of Ig Ab which late by Corona virus
Hi
The serology test looks for the presence of antibodies, which are specific proteins made in response to infections. Antibodies can be found in the blood and in other tissues of those who are tested after infection. The antibodies detected by this test indicate that a person had an immune response to SARS-CoV-2, whether symptoms developed from infection or the infection was asymptomatic.
Antibody test results are important in detecting infections with few or no symptoms.
Currently, CDC’s serologic test is designed and validated for broad-based surveillance and research that will give us information needed to guide the response to the pandemic and protect the public’s health. The test is not currently designed to test individuals who want to know if they have been previously infected with COVID-19.
The results of these studies will allow us to estimate how many people have been infected nationally. The results will also provide information about the percentage of U.S. residents who have not had COVID-19 and are still at risk for infection. This research is designed to help us understand who has been infected with SARS-CoV-2 and determine factors that confer protection against this virus.
https://www.who.int/news-room/commentaries/detail/advice-on-the-use-of-point-of-care-immunodiagnostic-tests-for-covid-19
Serologic tests are recommended in many countries but these tests are requires to confirmation by PCR or antigen detection test
4 days ago · The FDA is not aware of an antibody test that has been validated for diagnosis of SARS-CoV-2 infection. While the FDA remains ...
Dear Dr. Rasha
As Ab appearance require 2to 3 wks to develop, so the fast diagnosis mean fast health care.
Regards and wekcome
Hi dear Dr.
Good afternoon
Because it depend on the Ab titer which is late after infection
https://www.fda.gov/medical-devices/letters-health-care-providers/important-information-use-serological-antibody-tests-covid-19-letter-health-care-providers
The serology test looks for the presence of antibodies, which are specific proteins made in response to infections. Antibodies can be found in the blood and in other tissues of those who are tested after infection. The antibodies detected by this test indicate that a person had an immune response to SARS-CoV-2, whether symptoms developed from infection or the infection was asymptomatic.
Antibody test results are important in detecting infections with few or no symptoms.
Currently, CDC’s serologic test is designed and validated for broad-based surveillance and research that will give us information needed to guide the response to the pandemic and protect the public’s health. The test is not currently designed to test individuals who want to know if they have been previously infected with COVID-19.
The results of these studies will allow us to estimate how many people have been infected nationally. The results will also provide information about the percentage of U.S. residents who have not had COVID-19 and are still at risk for infection. This research is designed to help us understand who has been infected with SARS-CoV-2 and determine factors that confer protection against this virus.
It typically takes one to two weeks after someone becomes sick with COVID-19 for their body to make antibodies; some people may take longer to develop antibodies.
But can used in secreaing test and confirmation by pcr
The serology test looks for the presence of antibodies, which are specific proteins made in response to infections. Antibodies can be found in the blood and in other tissues of those who are tested after infection. The antibodies detected by this test indicate that a person had an immune response to SARS-CoV-2, whether symptoms developed from infection or the infection was asymptomatic.
Antibody test results are important in detecting infections with few or no symptoms.
Currently, CDC’s serologic test is designed and validated for broad-based surveillance and research that will give us information needed to guide the response to the pandemic and protect the public’s health. The test is not currently designed to test individuals who want to know if they have been previously infected with COVID-19.
The results of these studies will allow us to estimate how many people have been infected nationally. The results will also provide information about the percentage of U.S. residents who have not had COVID-19 and are still at risk for infection. This research is designed to help us understand who has been infected with SARS-CoV-2 and determine factors that confer protection against this virus.
The results of these studies will allow us to estimate how many people have been infected nationally. The results will also provide information about the percentage of U.S. residents who have not had COVID-19 and are still at risk for infection. This research is designed to help us understand who has been infected with SARS-CoV-2 and determine factors that confer protection against this virus.
https://www.researchgate.net/deref/https%3A%2F%2Fonlinelibrary.wiley.com%2Fdoi%2Ffull%2F10.1002%2Fjmv.25715
https://www.researchgate.net/deref/https%3A%2F%2Fonlinelibrary.wiley.com%2Fdoi%2Ffull%2F10.1002%2Fjmv.25715
Dear Dr.
The U.S. Food and Drug Administration (FDA) recommends that health care providers continue to use serological tests intended to detect antibodies to SARS-CoV-2 to help identify people who may have been exposed to the SARS-CoV-2 virus or have recovered from the COVID-19 infection. Health care providers should also be aware of the limitations of these tests and the risks to patients and the community if the test results are used as the sole basis to diagnose COVID-19.
The FDA is not aware of an antibody test that has been validated for diagnosis of SARS-CoV-2 infection. While the FDA remains open to receiving submissions for these tests for such uses, based on the underlying scientific principles of antibody tests, the FDA does not expect that an antibody test can be shown to definitively diagnose or exclude SARS-CoV-2 infection.
https://www.sciencemag.org/news/2020/03/new-blood-tests-antibodies-could-show-true-scale-coronavirus-pandemic
https://www.sciencemag.org/news/2020/04/these-are-answers-we-need-who-plans-global-study-discover-true-extent-coronavirus
:)
https://www.fda.gov/news-events/press-announcements/coronavirus-covid-19-update-serological-tests
Serological tests detect antibodies present in the blood when the body is responding to a specific infection, like COVID-19. They detect the body’s immune response to the infection caused by the virus rather than detecting the virus itself. Experience with other viruses suggests that individuals whose blood contains antibodies associated with SARS-CoV-2 infection—provided they are recovered and not currently infected with the virus—may be able to resume work and other daily activities in society. They may also be eligible to serve as potential donors of convalescent plasma.
https://www.fda.gov/news-events/press-announcements/coronavirus-covid-19-update-serological-tests٠
With thanks
According to Centers for Disease Control and Prevention ( CDC) "Serological tests can play a critical role in the fight against COVID-19 by helping healthcare professionals to identify individuals who have overcome an infection in the past and have developed an immune response"
Hi doctor
This regarded to false positive and negative as well as Ab titer not appear unless several dayes that effect on state of patients and community
Hi dear Dr. Rash
Due to fact that it will be negative during Window period while the RT-PCR is positive
BR
https://www.who.int/news-room/commentaries/detail/advice-on-the-use-of-point-of-care-immunodiagnostic-tests-for-covid-19
https://www.cdc.gov/coronavirus/2019-ncov/lab/serology-testing.html
Many causes male WHO don't depend on serological test like the disease not detected in window phase, specificity and sensitivity lowe than 95, cross reactivity، and the Ab still positive after recovering
Antibodies are produced over days to weeks after infection with the virus, Antibody detection tests targeting COVID-19 may also cross-react with other pathogens, including other human coronaviruses and give false-positive results .
Serological tests measure the amount of antibodies or proteins present in the blood when the body is responding to a specific infection, like COVID-19. In other words, the test detects the body’s immune response to the infection caused by the virus rather than detecting the virus itself. In the early days of an infection when the body’s immune response is still building, antibodies may not be detected. This limits the test’s effectiveness for diagnosing COVID-19 and why it should not be used as the sole basis to diagnose COVID-19.
https://www.fda.gov/news-events/press-announcements/coronavirus-covid-19-update-serological-tests
IgM detection can be used for diagnosis during acute infection, so i disagree with the fact that serology only measure body's immune response. The reason why WHO doesnt recommend serology could be as a result of cross reactivity.
Dear Rasha Hadi Saleh,
Serological tests ideally are not meant for the diagnosis of acute infection of any communicable disease be it COVID 19 or any other viral disease. Serological tests measure antibodies (IgM antibodies appear early in the infection while IgG antibodies appear late). Generally the kit based serology tests measure IgG antibodies which can just tell you that the person has had the infection some time back. These serological tests are best used for surveillance purpose or epidemiological studies
They are important for determining the response rate of a population against the infection. But it is recommended to do a good sampling and to use very sensible and specific tests
"WHO" is not against serological tests for the diagnosis of SARS-CoV2 viral infection (COVID-19).
Hi Dr.
Pls. see the following link
https://www.researchgate.net/deref/https%3A%2F%2Fwww.fda.gov%2Fmedical-devices%2Fletters-health-care-providers%2Fimportant-information-use-serological-antibody-tests-covid-19-letter-health-care-providers
Serology is necessary for measure the extension of the infection in broad areas Of the population
PCR is definite test for COVID19... but its cost is high and is not the first line... beside serologic tests are available with low cost in compare with PCR... also sampling is rapid and easy... so it is good for screening and diagnosis in sospicious patients
Serological tests detect the exposed individuals rather than diagnosis of patients. In the context of Covid-19, it will help in knowing the asymptomatic / self cured individuals.
Further,the self cured subjects will indicate the proportion of population with herd immunity and may be helpful in plasma therapy.
Antibody detection methods are indirect evidence of microbial infections. These are not ideal for diagnosis but may help!
Serology has several limitations; can be positive in the absence of the disease and can also give false negative result i.e in the presence of the disease. thus they are not recommended
