“The purpose of the Antibody Serology Tests is t
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Posted On: 08/21/2020 12:46:28 PM
Re: Puravida19 #15208
“The purpose of the Antibody Serology Tests is to give a negative (green) result which means you either do not have Covid-19 or you are at an early non-infectious 0 to 3 days prior to being infectious. That's the window that the test is good within.”
Your 3-day window seems to be based on the following:
* Prior to infection, you do not have Covid antibodies and will test negative.
* Infection occurs at t=0.
* It takes 3 days for the infection to build up in your respiratory track and for you to become contagious.
I agree with those points.
I would also agree that if you take the antibody test at t = 1 hour you will still test negative and could safely be cleared to enter the stadium that day, or even over the next day or two. You are not going to infect anyone else until possibly the third day.
The problem is that you will not know if your negative antibody test was taken at t = 1 hour or at t = 72 hours, or even during day 5 after infection.
According to the CDC webpage “Using Antibody Tests for COVID-19”:
https://www.cdc.gov/coronavirus/2019-ncov/lab...tests.html
According to the Mayo Clinic webpage “COVID-19 Antibody Testing”:
https://www.mayoclinic.org/tests-procedures/c...c-20489696
If a person is non-contagious for 3 days, then contagious starting on day 4 until day 14 and the antibody test is likely to not change from a negative result to a positive result for up to day 14, then most of the contagious people being tested will get a negative test result (green status) and will be allowed to enter the stadium.
A portion of those that have already been contagious for a week and get tested on day 10 or later, may get screened out, but there would still be a bigger portion of the contagious people being allowed into the stadium, increasing the risk to others.
Your 3-day window seems to be based on the following:
* Prior to infection, you do not have Covid antibodies and will test negative.
* Infection occurs at t=0.
* It takes 3 days for the infection to build up in your respiratory track and for you to become contagious.
I agree with those points.
I would also agree that if you take the antibody test at t = 1 hour you will still test negative and could safely be cleared to enter the stadium that day, or even over the next day or two. You are not going to infect anyone else until possibly the third day.
The problem is that you will not know if your negative antibody test was taken at t = 1 hour or at t = 72 hours, or even during day 5 after infection.
According to the CDC webpage “Using Antibody Tests for COVID-19”:
https://www.cdc.gov/coronavirus/2019-ncov/lab...tests.html
Quote:
Key points:
*In general, a positive antibody test is presumed to mean a person has been infected with SARS-CoV-2, the virus that causes COVID-19, at some point in the past. It does not mean they are currently infected.
*Antibodies start developing within 1 to 3 weeks after infection.
*We currently don’t have enough information yet to say whether someone will definitely be immune and protected from reinfection if they have antibodies to the virus.
According to the Mayo Clinic webpage “COVID-19 Antibody Testing”:
https://www.mayoclinic.org/tests-procedures/c...c-20489696
Quote:
After infection with the COVID-19 virus, it can take two to three weeks to develop enough antibodies to be detected in an antibody test , so it's important that you're not tested too soon.
If a person is non-contagious for 3 days, then contagious starting on day 4 until day 14 and the antibody test is likely to not change from a negative result to a positive result for up to day 14, then most of the contagious people being tested will get a negative test result (green status) and will be allowed to enter the stadium.
A portion of those that have already been contagious for a week and get tested on day 10 or later, may get screened out, but there would still be a bigger portion of the contagious people being allowed into the stadium, increasing the risk to others.
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