Effect of INH treatment on results of assays for diagnosis of latent M. tuberculosis infectiona

INH treatmentNo. of subjectsNo. of subjects positive by the following test/total no. tested (%)
No1917/19 (95)8/19 (42)8/17 (47)16/17 (94)
Yes88/8 (100)1/8 (12.5)3/7 (43)6/7 (86)
  • a In 27 persons with a documented positive TST result after a known exposure to TB.

  • b Of 24 subjects blood samples were available for ELISPOT and LST.