5. the location of primary focus in lungs is special 6. prognosis is good in most children with primary
tuberculosis and lesion is healed with absorption, calcification or scleroma 7. Most of them have contact history with tuberculosis patients 8. The younger the patient, the more valuable of PPD test
In China
330 million infected 1 million new cases annually 250 000 deaths each year The infection rate is 9.6% in <14year old
childrem
Characteristics of pediatric TB
1. More severe tuberculosis infection 2. Tissues and organs are hypersensitivity to
tuberculosis bacili
Intrapulmonary:there is an extensive inflammation around primary focus
organs of rich vascularization such as brain, liver, bones&joints, kidney, lung-apex region under normal cell mediated immunity, they are silent foci (dormant) potential for reactivation