Latent tuberculosis infection among close contacts of non-residential pulmonary tuberculosis patients in Shanghai, China

摘要

Background: Under the fast urbanization, Shanghai is hosting more and more domestic rural-to-urban migrants who do not have a certified local residence. Tuberculosis is more prevalent in rural population in China. In 2014, non-residential population has accounted for 42.9% of new pulmonary tuberculosis (PTB) patients in Shanghai. Close contacts of non-residential patients are at high risk of latent tuberculosis infection (LTBI). This study aimed to understand the prevalence of LTBI in close contacts of non-residential PTB patients, and to identify the risk factors associated with LTBI in Shanghai.