When a tuberculin skin test is positive,the hard center and erythema surrounding the induration are a result of which of the following? (Select all that apply.)
A) Histamine
B) T lymphocytes
C) Immune complexes
D) Products of complement
E) Macrophages

Question

Quizplus · Accepted Answer

The reaction site is infiltrated with only T lymphocytes and macrophages,resulting in a clear hard center (induration)and a reddish surrounding area (erythema).

When a Tuberculin Skin Test Is Positive,the Hard Center and Erythema