Jupiter and Saturn, both are presently transiting in Capricorn (Makar), a Sign owned by Saturn himself. Saturn was not affecting many entities until now, but once Retrograde, it, and Jupiter, will cast effects on more people and entities. The effect can be positive too.
Until now, Saturn was adversely affecting only Uttarashadha and Mrigshira (and some more for which these 2 Nakshatras do not give good results). Directional Saturn is positive for these Nakshatras too if it gives them good results. But its effect was on LESSER entities.
Once retrograde, it will put many more entities across this world under effect (+ve or -ve depending on chart), and also because Saturn and Jupiter are having common Rashi and Nakshatra Lords. The common co-ruling Grahas of Saturn and Jupiter indicate effect on health/lives.
In the perspective of COVID spread, I do not see Retrograde Saturn (& Retrograde Jupiter) bringing in any relief, rather they both, when Retrograde, will affect more people (and may be countries).
If both good in your chart, good 4 months to make out the most. Good luck.