As Doug said, vet. But before you do this, get the snake off that bark stuff and onto newspaper. See if the sneezing stops. Elevate temps - snakes need higher temps to combat infection.

I had a few kings sneeze with mucous. Took them off of wood-based particulate substrates, put them on newspaper and all symptoms went away. In those cases, it was the substrate irritating their nostrils and not a viral or bacterial infection. Worth a try for sure.

Post back here and give an update.

Really, bark is not the best substrate for Cal kings. In fact, if I remember correctly, doesn't tree bark have a high concentration of certain chemicals that have been shown to irritate mucous membranes? I think true for some trees, certainly not all (cork for example). I had better look that up before I state it as fact. Anyway, newspaper for your Cali.
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Mark

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