False Negative Result
Those who are immunologically compromised, especially those with HIV and low CD4 T cell counts, frequently show negative results from the PPD test. Steroid use, malnutrition and sarcoidosis can also lead to false-negative results, because the immune system needs to be functional to mount a response to the protein derivative injected under the skin.
Read more about this topic: Mantoux Test
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—Unknown. Binnorie; or, The Two Sisters (l. 55)
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—Julius Caesar [Gaius Julius Caesar] (100–44 B.C.)