title: Responsiveness to timothy grass pollen in individuals without known natural exposure in an allergen challenge chamber.
abstract: BACKGROUND
  The responsiveness to a nonendemic grass species is unknown and cannot be research without an allergen challenge chamber.
  
  
  OBJECTIVE
  To determine the clinical responsiveness to timothy grass pollen (TGP) in participants without known natural exposure in an allergen challenge chamber (ACC).
  
  
  METHODS
  Of the 26 screened participants, 22 met screening criteria and completed the 2 chamber exposures. The study consisted of an initial screening visit that included a blood draw for serum specific IgE (ssIGE) to Bermuda grass pollen and TGP followed by a 4½-day run-in phase and two 3-hour ACC exposure visits. This study was performed early in the first week of December 2013, when no seasonal pollens were detected in San Antonio, Texas. Symptom scores were recorded at baseline and every 30 minutes.
  
  
  RESULTS
  Of the 26 screened participants, 22 met the screening criteria and completed the 2 chamber exposures. Thirteen participants had always lived in South Texas without natural exposure, and 9 had previously lived in areas with TGP exposure. All participants tested positive to TGP and Bermuda grass pollen. Twelve and 13 of 22 had positive ssIgE test results to Timothy and Bermuda allergens, respectively, with 11 having positive results for both allergens. There were strong correlations among skin prick test size, a positive ssIgE test result, and high symptoms from TGP exposure. There was little difference in symptoms between those who had lived their entire lives in South Texas and those who had lived elsewhere.
  
  
  CONCLUSIONS
  In Texas, where exposure to TGP is minimal, strongly positive SPT and ssIgE test results were predictors of high symptoms to TGP exposure. Never exposed participants in South Texas reacted to TGP similar to those who had previous natural exposure, suggesting that in vivo cross-reactivity may be higher than predicted by prior in vitro data and may allow the use in clinical trials of allergens not endemic to the locale of an ACC.
authors.affiliation: Biogenics Research Chamber LLC, San Antonio, Texas. Electronic address: danrami@gmail.com.
authors.forename: Daniel A
authors.initials: DA
authors.lastname: Ramirez
authors.affiliation: Biogenics Research Chamber LLC, San Antonio, Texas.
authors.forename: Charles P
authors.initials: CP
authors.lastname: Andrews
authors.affiliation: Biogenics Research Chamber LLC, San Antonio, Texas.
authors.forename: Cynthia G
authors.initials: CG
authors.lastname: Rather
authors.affiliation: Biogenics Research Chamber LLC, San Antonio, Texas.
authors.forename: Robert L
authors.initials: RL
authors.lastname: Jacobs
mesh_terms: D000328:Adult; D000368:Aged; D000485:Allergens / Q000276:immunology; D001985:Bronchial Provocation Tests; D003429:Cross Reactions / Q000276:immunology; D031744:Cynodon / Q000276:immunology*; D004781:Environmental Exposure; D005260:Female; D006801:Humans; D007073:Immunoglobulin E / Q000097:blood* / Q000276:immunology; D008297:Male; D008875:Middle Aged; D031784:Phleum / Q000276:immunology*; D012882:Skin Tests; D013781:Texas; D055815:Young Adult
chemical_list: D000485:Allergens; D007073:Immunoglobulin E