^ The US has most Covid-19 cases because they conduct way more tests than any other country, including China. If Indonesia, for example, has more testing capabilities, only God knows how many actual cases we have.
As for reserve currency, I believe no countries have only USD in their reserve since they use a portfolio from various asset classes. But sure, they store some portion of USD to stabilize their exchange rates against USD.
Anyways, the US still has the biggest pile of gold (the 2nd position not even close):
https://www.statista.com/statistics/267998/countries-with-the-largest-gold-reserves/That makes sense. As far as I know, some countries like China and Russia are manipulating COVID-19 cases for their own convenience. With more tests, comes the ability to detect cases of the disease at a faster rate than any other country in the world today. While the pandemic has negatively affected the US economy, the USD is still standing strong. For a collapse to happen, the economy needs to be in a recession (or depression) for a very long time. If the US is unable to recover its economy, then the USD will certainly lose its position as the reserve currency of the world.
It's only been 4 months since the pandemic hit the United States, so we'll have to wait how everything unfolds during the remainder of the year. One thing for sure is that China is one step closer to launching a digital version of the Chinese Yuan. If it becomes the first country to launch a CBDC, it could gain a competitive edge over the world's economy. The US needs to act fast by paving the way for the development (and hopeful) adoption of the Digital Dollar. Otherwise, the USD may see its demise as the dominant currency of the world.
Nonetheless, no one knows what will happen in this world of uncertainty. After the COVID-19 pandemic is over, things will never be the same as before. We will gradually shift from physical interaction, to a wholly digital one. It's a good thing that the US is the second-largest Gold holder of the world, which could give it an "edge" over a decaying Fiat currency. Either the US will recover quickly after all of this is over, or all the other way around. Just my thoughts