As of this week, the Delta variant has become the predominant strain in the US, just as it is in the UK and in nearly all of Europe.
The Delta variant mutation caused a specific fold in the geometry of the spike protein that causes it to bind to cells more efficiently.
In the United States, COVID-19 case rates have decreased to three cases per hundred thousand per day.
Over the last few days, estimates are that the delta variant is responsible for 10% of all new cases in the United States.
In the US, over the last week, the rate of decrease in numbers of cases and deaths has fallen, and 20 states have seen an increase in cases.
In the United States case levels are down to levels not seen since the “14 days to stop the Virus” in March of last year.
In most of the world, the steady improvement trends continue. Even India has seen rates fall to roughly half of where they were 3 weeks ago.
The recent news is the CDC’s statement that in most situations people who are vaccinated do not need to wear a mask either indoors or out.
In the United States cases dropped over 21% in the last week, now running at about 12 cases per 100,000 per day.
The US data continues to be going in the right direction with cases decreased by another 10% this past week.