Risk of TB Disease by Time of M. tb Infection
Among 1,472 persons enrolled in the placebo arm of 2 trials
of the efficacy of LTBI (Ferebee SH. Adv Tuberc Res. 1970)
19 developed TB in 1st yr of follow-up (FU)
7 developed TB in subsequent 7 yrs of FU
Difference in case rate 12.9 vs 1.6 per 1,000 person-yrs
Among 2,550 British children enrolled in the unvaccinated
arm of TB vaccine study (Sutherland I. TSRU Prog Rep. 1978)
121 (5%) developed TB in 15 yrs of FU
Of these, 54% cases during 1st yr, 82% within 2 yrs