And like many have said countless times, a resurgence/second wave is expected. The magnitude will depend on how countries and especially population in general faces the threat. In some countries, like Spain (closest to Portugal, so I know more about it) looks like a good part of the population already forgot what happenned in March, April, and May.
It seems like the USA is still is the first wave...
I predicted a couple months ago the US will settle out by the end of August, that the disease has to go through the community. The northeast (NY and NJ) was hit first. It needed to go through the west and south which it's now doing. I think the "resurgence/second wave" in other countries is really a continuation of the first wave. Hopefully America will be done with that and will be able to deal with small "outbreaks" more easily.
Now whether there will be a second wave, one brought on by a variant of the disease, I don't know. Time will tell. But countries like America, Portugal, Spain, Italy, and Sweden, who got hit harder than others, for whatever the reasons, will stand up better going forward. What doesn't kill you makes you stronger.
Here’s why new cases of the coronavirus are down across most of the U.S.
https://www.cnbc.com/2020/08/25/new-cases-of-the-coronavirus-are-falling-in-most-of-the-us.html