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How to choose a sterilization test?

BOWIE & DICK	HELIX	PRION
Has to be carried out once every day, in an empty autoclave, on a specific Bowie & Dick cycle	Has to be carried out once every day, in an empty autoclave, on a specific Helix cycle	Has to be carried out on each autoclave cycle: A Prion test must be put inside each sterilization pouch to guarantee the sterilization to Prions.
Tests the steam quantity spread inside the autoclave	Tests the steam quantity spread inside the autoclave	Tests the presence of Prion proteins, responsible for the Kreutzfeld-Jacob disease
= a small pouch which contains 10 layers of thick cardboard	= a 1.5 m long tube closed at one end and open at the other end
The test : A sheet printed with heat-sensitive ink can be found at the center of the layers	The test : There is a capsule positioned at the closed end. The paper slip printed with heat-sensitive ink can be found inside the capsule	The test : Small paper slip printed with heat-sensitive ink
Yellow to black color change	Yellow to black color change	Yellow to black color change