|Molecular Weight of Agent||N/A|
|Occupation|| Laboratory animal workers|
|Outcome/Diagnosis||The risk of sensitization to laboratory animals|
|Activity Intervention|| The use of respiratory protective equipment|
|Participation Rate||776 workers participated in the survey conducted between 1999 and 2001|
|Intervention Effectiveness||In employees who worked with animal for <5 years and entered the animal house daily, the use of face masks at first exposure was associated with a significantly lower prevalence of specific sensitization to laboratory animals.
While laboratory animal workers with work-related chest symptoms were less likely to use masks compared to those without such symptoms (56% versus 67%, respectively), this difference was not statistically significant.|