Research to the rescue

As one would expect, in a few delusional individuals, there is the re surfacing of ideas that seek to entirely discredit the validity of the current test results for COVID - 19.  

The same sort of theories put forward  previously that the moon isn't real and the planet was in the grips of shape-shifting alien reptiles. But some have had the last laugh, becoming wealthy as sought after authors.  

But we need not be dismissive, as such people, who appear to be delusional, may well stumble across some idea worth exploring, as a consequence of one particular obsession or another.
There have been ideas floated that the current testing is fatally flawed and the deaths attributed to the virus are erroneous, posting they are due to other causes and are greatly exaggerated.

But what has made the current testing regime more reliable, was the completion in 2003, after 13 years of research, involving the ability to identify the sequence of the human genome- the genes that make up you and I. The principal mover was the US, but there were significant international teams in the United Kingdom, France, Germany, Japan, and China.
Modern day advances made possible by this project into understanding gene sequencing. has allowed scientists to trace and monitor the COVID-19 pandemic faster than any previous outbreak. However, there remain gaps in our knowledge.
One of the tools developed, called Genome Detective, can take the raw data from the sequencing machine, filter out results from non-viruses, piece together the genome and use that to identify the virus. It does not rely on any prior guesses or hypotheses, so it can even identify viruses that have not been seen before. This was used to confirm the first case of COVID-19 in Belgium, identifying it as a SARS-related coronavirus.
‘You can see from the sequences how the virus spreads, the speed at which it's spreading and estimate the number of people that are infected.’
Professor Anne-Mike Vendome, KU Leuven, Belgium

One gets the impression of those who seek to discredit the current testing methodology don't grasp the very nature of a virus, since the interesting point about a virus is it cannot exist for long outside of a host. Rather, they depend upon borrowing from the hosts DNA or RNA to replicate and thereby cause wreckage of one kind or another within the host.  
Genes are simply molecular blueprints used in the construction of cells, tissues, and organs. The environment within each cell serves as a ‘contractor’ who reads and engages those genetic blueprints and is ultimately responsible for the character of a single cells ‘awareness‘of the environment, not its genes that sets into motion the mechanisms of life.
But of course, the outcome of the virus invasion is use the cells sequencing to accommodate its spread, in the case of the COVID -19 into the lungs, which become starved of oxygen.

Being in poor health means the body is a weakened position, as it is already engaged in fighting off other illnesses of one kind or another and hence one is more likely to succumb to the virus invasion.

But for the most part the arrangement for our interaction with viruses are concerned works well, as in the human gut they protect the body from cancerous cells that otherwise would cause havoc. On planet earth there are astonishing number of viruses distributed amongst life, inclusive of our oceans, which are mostly harmless. The problem arises when we start to infiltrate ancient forms of co- existence in animals, to expose ourselves to a virus or a mutant version to which we have no immunity. More funding is needed into research in this area and education to the dangers inherit in consuming exotic rare animals, to ban their export and consumption, since the current virus seems to have been derived initially from bats.