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Whats the purpose of a two-step TB test?

purpose TB Test two-step
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Whats the purpose of a two-step TB test?

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A 2-step TB test gives a more accurate baseline reading if a person has been in contact with active TB or had a BCG vaccination in the remote past. A person needs only one 2-step mantoux. Thereafter a single mantoux should be accurate if the person is healthy.

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