The Covid-19 Antigen Test
To set up a Covid-19 Testing Program, one must first understand the difference between a serologist and an antigen test. The antigen test detects a certain virus protein that appears right after being infected, between zero and five days. After five days, the test loses a lot of accuracy as it's going to give you a bunch of false results, false positives, and false negatives. So the purpose of the antigen test is really to detect if you have been infected with covid-19 recently.
The Covid-19 Antibody Test
The serological test detects the antibodies that will appear 10 to 14 days after being infected. When covid-19 antibodies are detected, it indicates that a specific person has been infected for 10 to 14 days. That is a lot of time to infect other people. So it's a bit of a catch 22.
Covid-19 Test for Virus Infections
If you want to put in place a testing program and use the best test to detect infected people, employees for example. Then one would use the antigen test, ideally twice a week or at least once every week.
Testing For Vaccine Effectiveness
The serological test will be used a lot more for pharmacovigilance, which is after people got their vaccine. Test on a monthly basis to see if they still have antibodies – to see if they are still protected against the covid-19.
Knowing the Purpose for Testing
The point being, there is a different purpose for each type of test. To implement an effective Covid-19 test program one needs to understand them both and to be clear on what the overall program requirements are.
For example, if it's for a government they will likely distribute it to their population, like Ontario. There the government just purchased three thousand antigen tests and they're making them available for free to hospitals or organizations.
If it's for companies, there will need to test protocol. They might need help as well in addressing, "What do you do? How do you test? How do you record? What do you do if someone is positive?" You need to have a protocol in place and there is a lot that may not be obvious. If you or your company need help as part of our service we can assist in discussing what would be most appropriate.'