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False-Positive Tuberculin Skin Test Results Among Low-Risk Healthcare Workers Following Implementation of Fifty-Dose Vials of Purified Protein Derivative

  • Jeffrey M. Collins (a1), Mary Hunter (a2) (a3), Wanda Gordon (a2), Russell R. Kempker (a1) (a2), Henry M. Blumberg (a1) (a2) and Susan M. Ray (a1) (a2)...


Following large declines in tuberculosis transmission the United States, large-scale screening programs targeting low-risk healthcare workers are increasingly a source of false-positive results. We report a large cluster of presumed false-positive tuberculin skin test results in healthcare workers following a change to 50-dose vials of Tubersol tuberculin.

Infect Control Hosp Epidemiol 2018;39:750–752


Corresponding author

Address correspondence to Jeffrey M. Collins, Division of Infectious Diseases, Department of Medicine, 49 Jesse Hill Jr Drive, Atlanta, GA 30303 (


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