COVID’s Delta Variant is far more infectious than the earlier versions. It also differs in which age group is most susceptible, as this study from South Korea points out.
It's no secret that yet another nasty COVID variant has emerged; omicron is spreading even faster than delta and there will be consequences. And other variants will surely emerge. Where? Impossible to say, but its name will be pi. Should this happen in the US, we might get stuck with a catchy, but unwanted name.
Just what we need: another COVID variant. This one is called Delta AY.4.2 and it's now circulating in the UK. It might be a bit worse than the already awful Delta variant. Should we be concerned? And what does this suggest about COVID in the future?
I get it. People are sick and tired of COVID and endlessly cranky about having to deal with the changing facts and rules. Some of this discontent is expressed as dissatisfaction with the vaccines. While this frustration may be understandable it is not warranted. The vaccines are nothing short of a medical miracle. Don't shoot the messenger RNA. Blame the virus.
June and July saw substantial changes in the progression of the COVID-19 pandemic, essentially reflecting the competition between relief from vaccination and the spread of the more contagious delta variant of the virus. These changes varied by time and place; here we seek perspective by examining temporal trends in six regions of the US 
As the Delta variant becomes THE primary source of COVID-19 infections there’s a growing body of knowledge to explain why this is happening. Let's consider two new studies and a fact we may have forgotten.
The CDC is again recommending that fully vaccinated Americans mask up in certain circumstances. This is bad advice at odds with the available evidence that will only seed more vaccine hesitancy.
A Texas wedding this past April became an unintentional experiment in vaccine efficacy. All 92 guests were vaccinated but COVID disease broke through in six people. Four of them got one of the mRNA vaccines and developed one mild illness. Two got Covaxin, a vaccine developed in India. Both became very ill and one subsequently died. The culprit was the dangerous delta variant.