Mold is not uncommon in conditions that occur with fridges and freezers. I'd definitely coat that bare wood with Urethane or your favorite finish and then clean it once in a while with a bit of bleach cleaner.
And I'm curious about that "Mold Armor" that RedBeard mentions. Might be worth looking into for a recurring problem area.
What year is this?
It's the Viking age.
That explains the Laser Raptors! F***! I went back in time too far! - Kung Fury