Do not ever trust the covid test. My wife tested negative when she had all symptoms but fever. That day I lost my sense of taste. Several months later she got antibody tested and had them. So the COVID test was a false negative.
That is the problem. PCR tests are 30% false negative. Antigen tests are 60% false negative. Sources at end.
In the UK, a death certificate will only report a death, in most cases, as from Coronavirus, if the death occurred within 28 days of a positive test.
Covid-9 affects every part of your body. If you test positive for Covid, but die 6 months later of heart failure, it will be recorded as heart failure, not Covid-19. The fact that the Coronavirus damaged your heart, and killed you later, is not noted. Probability is that you would still be alive, if you had not had coronavirus. Ditto testing positive for Covid-19 now, but dying 5 years later from Kidney failure.
If you look at all the ways Covid-19 kills, and realise most are not recorded as Covid cases, you start to realise, there is a massive under reporting of Covid-19 cases.
I swear I have had Covid-19, but in the early days, there were no test. So everyone, who did not go to a doctor / hospital would not be recorded as having had Coronavirus.
So if around 200 million people worldwide are recorded as having Covid-19, I suspect the total is much higher.
Sources for False positive / false negatives - It was hard work to find anything about false results, either positive or negative. I learned so much about how the virus works, how the test work, and how they interact. And now understand why it is so hard to predict how well any Coved test works.
I did find two articles one by the BMJ, who search peer reviewed journals and distil the data
PCR testing for SARS-CoV-2 is far from 100% sensitive
And also one by a university
Epidemiologist AMA FAQ
There were various other articles, but not with a reasonable academic background. It seems generally accepted, that false positive run at 1-4% and false negatives at up to 30%.
Overall, it appears to me, that the over counted false positives are dwarfed by the undercounted false negatives.