What is the most scientifically accurate term used to describe the kingsnake's protection against pit viper venom?

Answer

Highly resistant or tolerant

While often described as immune, a more scientifically accurate term might be highly resistant or tolerant, as absolute, 100% immunity is difficult to confirm.

What is the most scientifically accurate term used to describe the kingsnake's protection against pit viper venom?
venomimmunitysnakeRattlesnakeKingsnake