Pirquet's reaction

Pirquet's reaction

 [per-kāz´]
appearance of a papule with a red areola 24–48 hours after introduction of two small drops of Old tuberculin by slight scarification of the skin; a positive test indicates previous infection with tubercle bacilli.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.