That's not how PCR or antigen tests work. PCR tests use 'primers' which link to specific sequences present in the target RNA (SARS2, like all SARS and coronaviruses, uses a single strand of RNA), and then multiply those sequences (https://en.wikipedia.org/wiki/Polymerase_chain_reaction) which are measured by pushing them through a gel with an electric charge (gel electrophoresis), which leaves bands on the gel media used identifying the size of the pieces, which is pretty specific regarding particular segments of DNA and RNA, and antigen tests which link to antibodies in the sample, that flouresce under UV light, revealing the presence of the antibodies.
I am unfamiliar specifically with exosome tests, or which specific primers are used by which specific PCR tests, which is a major question regarding this very issue. Are those primers specific to SARS2 or to all coronaviruses? Published papers on the specific tests in use by specific jurisdictions would effectively answer these questions, and I am not presently able to provide links to that specific research.
I wish I was better informed in that exact information. It is clearly necessary to ascertain the nature and reason we are under threat today. We are under threat. We need to know the specific threat, and as much as we can discover as to it's nature. Other than the pandemic, about which much is variably published and known, we certainly face food insecurity, even if only due to the Grand Solar Minimum ongoing that halved harvests last year, and possibly the most existential threat to everyone is the ubiquitous increasingly draconian imposition of martial law in every jurisdiction, from America to China. On top of that the increasingly fluid geopolitical contest continues to grow the threat of expanded military conflict, which could quickly change everything for the worse.
The continuing crusade for oil currently devastating the ME is clearly at risk of expanding, and it's probably remarkable it hasn't already spread to directly impact each and all of our homelands.
We do need to know specifically what is being tested for, and who is using what tests. We already know we're being corralled and effectively under house arrest, more and more censored and limited to 'official' propaganda sources of information, and should expect ongoing disruptions in critical supplies, including food.
We need to act to secure ourselves against known threats and ongoing harms, while seeking the necessary information to understand those we do not have the ability to rationally prepare for because we do not have good information on them.
Many research type people are saying that COVID-19 has parts from covid, SARs and HIV... so a PCR test would mostly test positive for any and all three tests.
BUT, this is really speculative as we seem to be dealing with at least three COVID viruses. COVID-19a,b,c
Unless COVID-19 really is worse for asians, as some have reported.
Anyway, the numbers i have seen for COVID-19 tests is you need at least four tests to get one pretty accurate answer. The tests are really that bad.
And i am dubious about anything that says "5 minute tests".
This is one of those cases where i can only wait and see.
Hindsight will be 20/20
i cannot really tell if this virus is all hype/psyop or real.
If people can get reinfected with COVID-19 as many have reported (so no antibodies.. or something completely different) then we are going to see the 2nd wave be really bad.
Not any well designed test. It doesn't have to select only from those parts in the various progenitor virii, but can home in on unique features of SARS2, which is what any competent manufacturer of PCR tests would do.
What seems to be going on is that any immunity only is developed in the young, and older folks aren't getting immunity. There's also been research that reveals SARS2 is able to infect nerve cells, and enter a state of dormancy, like herpes virii, from which, like herpes virii, it can re-emerge later.
In second waves of infection, folks that did not develop immunity from the first infection are nonetheless sensitized to the effects of the pathogen and all SARS vaccine trials (SARS-CoV-2 is a SARS virus) reveal increased morbidity and mortality upon infection after vaccination, so more harmful disease and more deaths the second time around. Estimates I've seen indicate up to 20% mortality from the second wave of infection for previously infected people.
The infection of nervous tissue also may explain why one of the symptoms of covid-19 is the sudden loss of the sense of smell, and why we see folks just suddenly keel over dead, as infection and destruction of autonomous nervous system mechanisms that control heartbeat and breathing would cause.
The chimeric nature of this pathogen is startlingly different from other coronavirii, and the research into what it actually is and causes, how it will behave, and much else is just beginning. Let's hope recent publications and papers seeking to downplay the severity of the initial flu-like symptoms is borne out as more data is gathered and considered.
Let's also hope persistent symptoms unlike anything other respiratory virii cause are shown to either have been misunderstandings or faulty data. The present suite of effects claimed includes AIDS, sudden death, infertility, no immunity and actual sensitization to re-infection, durable persistence in nerves and unpredictable re-emergence, and loss of sense of smell. I'd really rather deal with the flu.