title: Humoral response to HspX and GlcB to previous and recent infection by Mycobacterium tuberculosis.
abstract: BACKGROUND
  Tuberculosis (TB) remains a major world health problem. Around 2 billions of people are infected by Mycobacterium tuberculosis, the causal agent of this disease. This fact accounts for a third of the total world population and it is expected that 9 million people will become infected each year. Only approximately 10% of the infected people will develop disease. However, health care workers (HCW) are continually exposed to the bacilli at endemic sites presenting increased chance of becoming sick. The objective of this work was to identify LTBI (latent tuberculosis infection) among all asymptomatic HCW of a Brazilian Central Hospital, in a three year follow up, and evaluate the humoral response among HCW with previous and recent LTBI to recombinant HspX and GlcB from M. tuberculosis.
  
  
  METHODS
  Four hundred and thirty seven HCW were screened and classified into three different groups according to tuberculin skin test (TST) status: uninfected, previous LTBI and recent LTBI. ELISA test were performed to determine the humoral immune response to HspX and GlcB.
  
  
  RESULTS
  The levels of IgG and IgM against the HspX and GlcB antigens were the same among HCW with recent and previous LTBI, as well as among non infected HCW. However, the IgM levels to HspX was significantly higher among HCW with recent LTBI (OD = 1.52 +/- 0.40) than among the uninfected (OD = 1.09 +/- 0.50) or subjects with previous LTBI (OD = 0.96 +/- 0.51) (p < 0.001).
  
  
  CONCLUSIONS
  IgG and IgM humoral responses to GlcB antigens were similar amongst all studied groups; nevertheless IgM levels against HspX were higher among the recent LTBI/HCW.
authors.affiliation: Departamento de Imunologia, Instituto de Patologia Tropical e Saúde Pública, Laboratório de Imunopatologia das Doenças Infecciosas Universidade Federal de Goiás, Goiania, Brazil. mfrabahi@terra.com.br
authors.forename: Marcelo Fouad
authors.initials: MF
authors.lastname: Rabahi
authors.forename: Ana Paula
authors.initials: AP
authors.lastname: Junqueira-Kipnis
authors.forename: Michelle Cristina Guerreiro
authors.initials: MC
authors.lastname: Dos Reis
authors.forename: Walter
authors.initials: W
authors.lastname: Oelemann
authors.forename: Marcus Barreto
authors.initials: MB
authors.lastname: Conde
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000907:Antibodies, Bacterial / Q000097:blood*; D000942:Antigens, Bacterial / Q000276:immunology*; D001426:Bacterial Proteins / Q000276:immunology*; D001938:Brazil; D002353:Carrier State; D015331:Cohort Studies; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D005260:Female; D006282:Health Personnel; D006782:Hospitals, Special; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood*; D007075:Immunoglobulin M / Q000097:blood; D017053:Infection Control / Q000379:methods; D008292:Malate Synthase / Q000276:immunology*; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D009169:Mycobacterium tuberculosis / Q000737:chemistry* / Q000276:immunology*; D011994:Recombinant Proteins / Q000276:immunology; D014376:Tuberculosis / Q000175:diagnosis / Q000276:immunology* / Q000517:prevention & control
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001426:Bacterial Proteins; C118127:HspX protein, Mycobacterium tuberculosis; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D011994:Recombinant Proteins; D008292:Malate Synthase