Screening of close contacts of pulmonary tuberculosis in an urban area in Shanghai, China: a cross-sectional study

Studies have shown particular emphasis should be put on those with bacteria-positive index cases or those who had presumptive TB based on symptom screening during follow-up. Since the proportion of latent tuberculosis infection is high among close contacts undergoing IGRA examination, measures such as tuberculosis preventive treatment can be considered to reduce the incidence of TB.