Now... what's with the renewed talk, the worry about the virus getting more severe when late fall/winter come - due to the temp change?
I thought that wasn't a factor. Or was it just convenient at the time to say so?
It's a novel coronavirus. So nobody really knows much about its long term behavior.
Flus tend to survive and thrive in cold weather, and that's a possibility with CV-19. Especially since it emerged in mid/late December, exactly at flu season. But no one can say if CV-19 will be a seasonal virus, or if it will continue year round at full strength, or will fade away once transmissions are stopped (a la SARS and MERS).
In late Feb, Trump said that the virus was likely to just disappear in the warm weather ... of April.
As for COVID-19 long term behavior, it's unclear how human antibodies will work. How long they'll stay in your system and how effective they will respond to a reinfection.
A lot of unknowns, including which type of vaccine will work best and when it will be ready. What treatments will be most effective (Trump and kiid's favorite, the malarial drug seems to have dropped out of the race). Trump might have been just kidding about taking it.