Table 1

Timetable for development of tuberculosis

Form of tuberculosisTime from infection to onset
Immune conversion4–8 weeks
Primary complex1–3 months
Local lung complications3–9 months
Pleural effusion (usually teenagers)3–12 months
Miliary/meningeal3 months onwards
Bone10–36 months
Skin5 years onwards
Renal10 years onwards
Secondary breakdown5 years onwards