Some strains of coccidia can withstand a "dry" heat of up to 400 degrees so the wood might catch on fire before the parasite is killed off in an oven. Boiling water penetrates the hard shells much more effectively, but you need to boil wood for a very long time so that the wood is totally saturated. Coccidia must be fully immersed in order for the hard shell to soften and it's easy for viable organisms to get lodged in little crannies where some of the spores inside never get soaked.
I use bleach but air the wood out for at least a week under a strong UVB light or natural sunlight so that the bleach fully outgases.
The Zombie Mama is here!