Nine percent of 2,721 hospital employees, previously tuberculin negative, were PPD positive when tested with 5 TU of PPD (Aplisol, Parke-Davis). Seventy percent of the positive reactions were found to be erroneous on retesting with Tubersol (Connaught). The excessive potency of Aplisol led to excessive expenditures of time and money investigating a nonexistent outbreak.
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http://dx.doi.org/10.1086/646854 | DOI Listing |
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