title: Latent tuberculosis infection among new recruits to the army in Beijing, China in 2009.
abstract: China is a country with high latent tuberculosis infection (LTI) and has a policy of routine BCG vaccination. To monitor tuberculosis (TB) infection, a total of 907 new recruits to the army were interviewed and routinely examined by chest radiographs. They were intradermally injected with purified protein derivative (PPD) and detected with enzyme-linked immunospot (ELISPOT) assay with recombinant CFP-10/ESAT-6 (rCFP-10/ESAT-6) fusion protein, as a stimulus, from December 2009 to February 2010. The prevalence of LTI among new recruits was estimated as 50.2% and 30.7% by PPD skin test and ELISPOT assay, respectively. Of 452 PPD-negative and 455 PPD-positive volunteers, 132 (29.2%) and 146 (32.1%) were ELISPOT positive, respectively. The overall consistency between these two tests was 51.4% (466/907). Although 65.6% of PPD-positive volunteers and 27.8% of ELISPOT-positive volunteers (spot-forming cells; SFC 12.2 ± 21.2) could find the vaccination scars on their arms, 21.3% of PPD-positive volunteers and 35.9% of ELISPOT-positive volunteers (SFC 18.3 ± 34.6) could not. Thus, the TB infection rate in army recruits in China was not as high as previously reported. The results suggest that the ELISPOT technique, we presented, is an accurate method for screening TB infection in China.
authors.affiliation: Army Tuberculosis Prevention and Control Key Laboratory, Institute for Tuberculosis Research, the 309th Hospital of Chinese PLA, Beijing, China. wu-xueqiong@263.net
authors.forename: Xueqiong
authors.initials: X
authors.lastname: Wu
authors.forename: Yan
authors.initials: Y
authors.lastname: Liang
authors.forename: Lan
authors.initials: L
authors.lastname: Wang
authors.forename: Zhiyun
authors.initials: Z
authors.lastname: Wang
authors.forename: Chuiying
authors.initials: C
authors.lastname: Zhang
authors.forename: Yourong
authors.initials: Y
authors.lastname: Yang
authors.forename: Junxian
authors.initials: J
authors.lastname: Zhang
mesh_terms: D000293:Adolescent; D001426:Bacterial Proteins / Q000032:analysis; D002681:China / Q000453:epidemiology; D058501:Enzyme-Linked Immunospot Assay / Q000379:methods; D006801:Humans; D007407:Interviews as Topic; D055985:Latent Tuberculosis / Q000175:diagnosis* / Q000453:epidemiology* / Q000382:microbiology; D008297:Male; D008403:Mass Screening / Q000379:methods; D008889:Military Personnel; D009169:Mycobacterium tuberculosis / Q000302:isolation & purification / Q000472:pathogenicity; D015995:Prevalence; D011993:Recombinant Fusion Proteins / Q000032:analysis; D014373:Tuberculin; D055815:Young Adult
chemical_list: D001426:Bacterial Proteins; D011993:Recombinant Fusion Proteins; D014373:Tuberculin