I'm 2 days late, but the point was not "Is there a DNA test to prove a specific variant exists". Testing centers do not DNA test every sample from every patient. That would take a ridiculous amount of resources. The tests are for specific proteins, and are usually so simple that a color change is the indicator. The CDC has pointed out that tests need to be done that can differentiate between different corona class viruses, with covid19 and influenza both being corona class viruses, and is proof the testing being done is not specific enough to tell one variant from another when the tests can be confused by common influenza. The problem with claiming a large number of delta variant cases is that DNA testing is not done on every sample, and thus there is no proof that all those cases are from a delta variant. They could well be from other "wild" variants, or they could be the same covid19 that has been around the whole time and the vaccines have a far higher failure rate than admitted. There is also the problem of Antibody-Dependent Enhancement, which we saw with the Dengue vaccine recall in the Philippines, where the antibodies produced actually made symptoms worse. You can read about ADE on PubMed. I should charge to teach people this stuff.