Ozone and Rhinovirus-Induced Disease in Asthmatics

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

60 participants

Study Classification

OBSERVATIONAL

Study Start Date

1999-09-30

Study Completion Date

2003-08-31

Brief Summary

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In the U.S., morbidity associated with human rhinovirus (RV) infection represents a major health problem. In asthmatics, up to 80% of asthma exacerbations are associated with upper respiratory infections. Despite evidence that environmental oxidant pollutants, such as ozone, may increase the severity of viral disease, the mechanisms underlying such an effect have not been identified. This study will test the hypothesis that exposure of allergic asthmatic subjects to ambient levels of ozone directly enhances viral disease by increasing infectivity and intensifying virus-induced inflammation.

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Detailed Description

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In mild asthmatics, the study will investigate: (1) if exposure to ozone will enhance the viral infective process in the nasal epithelium, (2) the effect of ozone exposure on RV-induced inflammatory gene expression, mediator release and inflammatory cell influx into the upper and lower airways, and (3) the interactive effects of ozone and RV on airway reactivity. This information will improve our understanding of the risk associated with oxidant pollutant exposure in this population of individuals in whom RV infection may represent a significant health concern.

Conditions

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Asthma

Study Design

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Study Time Perspective

PROSPECTIVE

Eligibility Criteria

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Inclusion Criteria

Subjects recruited will be non-asthmatic controls or mild allergic asthmatics using beta-agonists, mostly on an "as needed" basis. Selection criteria will include good general health by medical history and physical examination, no history of smoking, and the absence of respiratory infection in the preceding 6 week period. Subjects will undergo serologic testing and must have a negative test for neutralizing antibodies to RV16 to participate in all but one study of the project.

Minimum Eligible Age

18 Years

Maximum Eligible Age

45 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes