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A chest X-ray can rule out active infection. It is not sensitive enough to rule out latent infection, which is what the PPD is being used for. There are new serum tests which are not widely used or even available. A new test should be available in the next year which will get around some of the problems of all the other tests.
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I was there to see beautiful naked women. So was everybody else. It's a common failing.
Robert A Heinlein in "They Do It With Mirrors"
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