No need to worry.
Here's a quote from "The Conversation", a reliable, non-partisan, not-for-profit media site. It's trustworthy.
Even though it talks about snakes infecting humans, it works in reverse, too, as well as working for your gecko.
"Though snakes were early suspects as the source of the Wuhan coronavirus, reptiles have never been linked to any of the World Health Organisation’s top ten infectious diseases which pose the greatest threat of epidemics.
"One reason is straightforward. Snakes are cold-blooded (more correctly “ectothermic”) and have a very different physiology to humans. Viruses co-evolve highly specialised relationships with their hosts and are often species-specific.
"Occasionally, a chance mutation might allow a virus to infect another species, but the more different the new and old hosts are to each other, the less likely that is.
"Compared with transmission between mammals, or even from birds to mammals, the probability of a virus crossing from a cold-blooded reptile to a warm-blooded human is remote."
I wouldn't recommend reading the link if you're the least bit squeamish.
https://theconversation.com/snakes-...ont-help-the-fight-against-coronavirus-133075
