[BeauBo]

"How much of that is from reducing the cycle count of the PCR covid tests after inauguration day?"

There was a huge drop after inauguration day (actually starting Jan 8, shortly after the electoral votes were certified on the 6th). After that huge drop (about 75%), there was a smaller wave for about a month. We now seem to be distinctly on the downhill side of that wave. It looks even better in the five days since this chart:

[dynoman]

https://www.medpagetoday.com/infectiousdisease/covid19/90508

The positive test rate was bound to drop with lower ct counts on the PCR tests.