Interventions for Tuberculosis Control and Elimination 2002

Relative risk (log scale)
10
3
1
0.5
0.2
Ref
0
1 - 5 6 - 10 11 - 15 16 - 20 20 +
Induration (mm)
Figure 74. Risk of tuberculosis during follow-up by size of initial tuberculin skin
test reaction, Karonga District, Malawi. Reproduced from 831 by the permission of
the publisher Elsevier Science.
of T cell proliferation and interferon-gamma production. This could explain
to some extent the reduced efficacy of BCG in countries in the world where
helminthic infestation is common. 836
Number of reported cases
80
60
40
20
0
Discontinuation of mass
BCG vaccination
70 75 80 85 90
Year of report
Figure 75. Reported cases of mycobacteriosis due to M. avium complex, Sweden,
1969-1993. Data courtesy Victoria Romanus, Swedish Institute for Infectious Diseases.
122