Based on reports from late 2021, both Paul Stanley and Gene Simmons of KISS contracted COVID-19, but there are no reports of them suffering from long COVID.
Here are the details:
Paul Stanley: Tested positive for COVID-19 in August 2021, forcing the band to postpone shows. He described it as kicking his "ass" but recovered and stated he was "fine" shortly after. He later contracted a second, milder case of COVID-19 in December 2021.
Gene Simmons: Tested positive for COVID-19 in late August 2021, shortly after Stanley. He experienced "mild symptoms" and followed a 10-day isolation period.
Recovery: Both members recovered from their acute infections and returned to the stage to continue their tour in September 2021.
ABC7 San Francisco
There is no information in the provided search results to suggest that either Stanley or Simmons suffered from long-term, chronic symptoms (long COVID).
2025: Both members are still suffering covid 19 returning every several months. Long Covid percentage is pretty high. Booster shot do nothing for natural immunity.