How Does The Alleged Delta Variant Spread – When There’s No Specific Test?!

We’re being overflown with information, we are literally drowning. And the media knows about this effect – when you just bomb with information, the ones that are bombed don’t have the time to stand and think things through. Really think it through.
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The COVID madness came so fast. And the latest trend in the “COVID world” is the Delta variant. The anchors on the news are speaking about it over and over, patients are being infected, dying… But hey, is there any way to prove this Delta variant?
The testing for the DELTA variant is presented as an article of faith.
Here’s an example:
“Data from Public Health England (PHE) shows that, while the overall chances of getting reinfected are very low, the Delta variant, first identified in India and which accounts for around 99% of cases in the UK, poses a higher risk.
It came as new figures showed the breakdown of how many people in hospital with the Delta variant have had one or both doses of a Covid-19 vaccine.
From June 21 to July 19, some 1,788 people were admitted to the hospital after testing positive for Delta.
Of these, 970 (54%) were unvaccinated, while 530 (30%) had received both doses.
So how does the testing occur? It apparently requires some rather sophisticated laboratory analysis:
Although there are no direct Delta variant tests, PCR tests that are positive for SARS-CoV-2 can undergo genetic analysis such as ‘genomic sequencing’ which tells us if it is the Delta (or another) variant. This means it is possible to accurately identify if someone is unwell with the Delta variant of Covid-19.”
How again, can the doctors be sure it is the Delta variant, I once again ask?
Can you try and answer?