So as of the end of 2021 the CDC wants to stop including flu virus residuals as positive for Covid-19. This should help lower a population's Covid-19 test results irregardless of any supposed vaccination effectiveness.

cdc.gov: 07/21/2021: Lab Alert: Changes to CDC RT-PCR for SARS-CoV-2 Testing
After December 31, 2021, CDC will withdraw the request to the U.S. Food and Drug Administration (FDA) for Emergency Use Authorization (EUA) of the CDC 2019-Novel Coronavirus (2019-nCoV) Real-Time RT-PCR Diagnostic Panel, the assay first introduced in February 2020 for detection of SARS-CoV-2 only. CDC is providing this advance notice for clinical laboratories to have adequate time to select and implement one of the many FDA-authorized alternatives.

Visit the FDA website for a list of authorized COVID-19 diagnostic methods. For a summary of the performance of FDA-authorized molecular methods with an FDA reference panel, visit this page.

In preparation for this change, CDC recommends clinical laboratories and testing sites that have been using the CDC 2019-nCoV RT-PCR assay select and begin their transition to another FDA-authorized COVID-19 test. CDC encourages laboratories to consider adoption of a multiplexed method that can facilitate detection and differentiation of SARS-CoV-2 and influenza viruses.
Forbes.com: George Soros And Bill Gates’ Backed Consortium To Buy U.K. Maker Of Covid Tests For $41 Million
2021/07/19
The Soros Economic Development Fund and the Bill & Melinda Gates Foundation announced the launch of a new initiative, Global Access Health (GAH), aiming to strengthen the global rollout saving medical technology and the subsequent acquisition of Mologic Ltd, best known today for the deep-nostril technology used to deliver rapid Covid-19 tests. The technology can also be used to test for dengue, bilharzia and river blindness...

The rapid so-called lateral flow tests offer an early-warning screening for Covid-19 and have been used around the world as an aid to help reopen shops, bars, sporting events and workplaces by giving an early warning result for people who may have no symptoms but are still infectious and can give the virus to others. In the U.K., lateral flow Covid tests need to be confirmed by a second test before Covid-19 is officially diagnosed