title: [Investigation on freshmen's tuberculosis infection in 33 universities in Beijing].
abstract: OBJECTIVE
  To understand the immune level of the purified protein derivative (PPD) and the present conditions of the tuberculosis among the collegians.
  
  
  METHODS
  Standardized tuberculin testing with PPD 5 IU, social-demographic and epidemiological feature of tuberculosis were conducted in 105,239 freshmen from 33 universities in Beijing.
  
  
  RESULTS
  The scar rates of freshmen were 72.21%. The rates coming from cities were higher than those from countries. The scar rates were near equal for freshmen in different ages. However the rates were different evidently with the region where the students come from. The scar rates of freshmen from cities were 75.84%. The scar rates of the freshmen from countries were 62.78%. Tuberculosis infection rate of the freshmen was 51.99% and the strong positive rate was 14.63%. Tuberculosis positive rate of city students was obviously higher than that of rural ones. Tuberculosis positive rate of city students was 55.17% and the strong positive rate was 15.37%. Tuberculosis positive rate of rural students was 44.69% and the strong positive rate was 12.70%. There appeared great difference between them. Moreover, Tuberculosis infection rate was varied with age and region. The tuberculosis positive rate of students from north-east areas was the highest (72.10%, 7,746/10,744), and those come from the middle-north areas were the lowest (41.50%, 6,560/15,808). The tuberculosis positive rate (62.49%, 47,489/75,992) of the freshmen with the scar was higher than that of those without the scar (24.72%, 7,230/29,247). The tuberculosis positive rate of the freshmen having a touch with the tuberculosis cases (60.75%) was higher than those having not (51.96%).
  
  
  CONCLUSIONS
  As students in universities are susceptible population of tuberculosis, it should be emphasized to find out tuberculosis in university and to treat them early for the purpose of preventing the episode and explosion of the disease.
authors.affiliation: Departmant of Health Protection, Hospital of Tsinghua University, Beijing 100084, China.
authors.forename: Jian-li
authors.initials: JL
authors.lastname: Guo
authors.forename: Qin
authors.initials: Q
authors.lastname: Xu
authors.forename: Yu-qing
authors.initials: YQ
authors.lastname: Liu
mesh_terms: D000293:Adolescent; D002681:China / Q000453:epidemiology; D005260:Female; D006801:Humans; D008297:Male; D012424:Rural Population; D013334:Students / Q000706:statistics & numerical data; D014374:Tuberculin Test; D014397:Tuberculosis, Pulmonary / Q000453:epidemiology*; D014495:Universities / Q000706:statistics & numerical data; D014505:Urban Population; D055815:Young Adult