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PPD conversion

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PPD conversion
Infectious disease The conversion from a state of nonreactivity to reactivity to immune challenge by PPD, presumptive evidence of active TB unless proven otherwise. See Tuberculosis. Cf Anergy.


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The dramatic rise in PPD conversion rates in hospitals with outbreaks may result as much from nonspecific boosting as from true nosocomial transmission and acquisition of M.
The classification of risk is based on: 1) the profile of TB in the community, 2) the number of infectious TB patients admitted to the facility area, and 3) analysis of PPD conversion data for the facility's workers.
 
 
 
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