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In page Mantoux test:
"The Heaf test uses a spring-loaded "gun" with 6 needles to inject 10 TU (0.1 ml at 100 TU/ml, 1:1000) of PPD. It was discontinued in 2005 because the manufacturer of the device found it financially unsustainable.[1] The equivalent Mantoux test positive levels are:[citation needed]
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