Vaccination status Mean + SEM change in skin thickness(mm) Reaction status
  PPDA  PPDB* DB-DA  
Vaccinated 1.3 ± 0.47 3.6 ± 0.81 2.3 ± 0.75 4 of 7(57%)
Non vaccinated 1.0 ± 0.22 0.6 ± 0.20 0.7 ± 0.29 0 of 7(0%)
*P<0.05, tcal=3.44, ΔB, change in skin thickness to PPDB; A, change in skin thickness to PPDA
Table 2: Comparative intra-dermal tuberculin test response.