Judith Grimes, the daughter of Rick Grimes and Lori Grimes, is not explicitly confirmed to be immune to the walker virus in the The Walking Dead universe.
While Judith has survived numerous encounters with walkers and other threats, her immunity has never been explicitly stated or confirmed.
The show and comics have focused on other characters, like Carl Grimes and the introduction of the "Whisperers" who have shown to be resistant to the walker virus, but Judith's immunity has not been addressed directly.
It's possible that Judith's immunity is a plot point that will be explored in future episodes or comics, but currently, there is no concrete evidence to support that she is immune.
