title: The value of early diagnostic screens for the diagnosis of influenza A, B and Mycoplasma pneumoniae infections.
abstract: BACKGROUND
  Rapid diagnosis of influenza virus and Mycoplasma pneumoniae infections is of importance for therapeutic intervention. It was the aim of the study to evaluate screening tests for influenza A (Flu A), B (Flu B), and Mycoplasma pneumoniae (M. pneumoniae) infections in young patients admitted to the hospital.
  
  
  METHODS
  522 children and juvenile patients were admitted to the hospital because of symptoms suspecting Flu A, B or M. pneumoniae infections. Gold Immunochromatography Assays were used to screen for Flu A and Flu B and rapid identification culturing with subsequent polymerase chain reaction (PCR) was carried out at admission for identification of M. pneumoniae infections. Diagnoses were based upon seroconversion during the clinical course.
  
  
  RESULTS
  In the current study, 26% of 522 patients were shown to be infected with Flu A and 77% had positive screens using the Gold Immunochromatography Assays. 19% of 522 patients were infected with Flu B as diagnosed by seroconversion and 89% were detected by the screen. The rapid identification culture showed that 169 of 522 patients were M. pneumoniae positive. The positive samples based on rapid identification showed negative and poor concordance with PCR tests. The consistency test between the two screening methods mentioned above showed higher kappa value in the children group than infant group.
  
  
  CONCLUSIONS
  The results are in agreement with literature and indicate that in juvenile patients and children the screening efficiency was limited. PCR assays may be applied prior to evaluation of antibody titres in the case of M. pneumoniae infections confirming previous results. The pronounced effect of age on the outcome has to be taken into account for evaluation of the screening methods.
authors.affiliation: Department of Respiratory Medicine, The Military General Hospital of Beijing PLA, Beijing, PR China. linli411@gmail.com
authors.forename: Lanhua
authors.initials: L
authors.lastname: You
authors.affiliation: Department of Respiratory Medicine, The Military General Hospital of Beijing PLA, Beijing, PR China.
authors.forename: Hangwei
authors.initials: H
authors.lastname: Chen
authors.affiliation: Department of Oncology, The Military General Hospital of Beijing PLA, Beijing, PR China.
authors.forename: Chunhong
authors.initials: C
authors.lastname: Han
authors.affiliation: Department of Respiratory Medicine, The Military General Hospital of Beijing PLA, Beijing, PR China.
authors.forename: Peiyan
authors.initials: P
authors.lastname: Guo
authors.affiliation: Department of Oncology, The Military General Hospital of Beijing PLA, Beijing, PR China.
authors.forename: Xiaorong
authors.initials: X
authors.lastname: Huo
authors.affiliation: Department of Pediatrics, The Military General Hospital of Beijing PLA4, Beijing, PR China.
authors.forename: Bo
authors.initials: B
authors.lastname: Hu
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D042241:Early Diagnosis; D005260:Female; D005455:Fluorescent Antibody Technique; D006801:Humans; D007223:Infant; D009980:Influenza A virus / Q000302:isolation & purification*; D009981:Influenza B virus / Q000302:isolation & purification*; D007251:Influenza, Human / Q000175:diagnosis* / Q000821:virology; D008297:Male; D011019:Pneumonia, Mycoplasma / Q000175:diagnosis*; D016133:Polymerase Chain Reaction; D012680:Sensitivity and Specificity