Patient pathway analysis of tuberculosis diagnostic delay: a multicentre retrospective cohort study in China.

Objectives: Delay in diagnosis of tuberculosis (TB) is an important but under-appreciated problem. Our study aimed to analyse the patient pathway and possible risk factors of long diagnostic delay (LDD).

Methods: We enrolled 400 new bacteriologically diagnosed patients with pulmonary TB from 20 hospitals across China.

[A sero-epidemiologiecal study on hepatitis B among general population in Beijing].

Objective: To explore the serological infection rate of hepatitis B virus (HBV) in general population aged over one year old in Beijing and to provide information for control and prevention of the disease.

Methods: A multistage randomized cluster sampling was carried out in general population of Beijing, aged over one year old. Every study subject's hepatitis B immunization history and main risk factors were investigated through questionnaire.