Authors' response

We thank Liccardi et al for their interest in our article and for raising the issue of prior pet sensitization as a risk factor for developing occupational asthma.1 Another study found that a prior history of pet ownership and sensitization was associated with an increased risk of work-related asthma in animal shelter workers.2 Thus, in those workers exposed to pet allergens at home and at work, the peak flow monitoring protocol described in our stepwise diagnostic approach would not always be useful in distinguishing between work-related and non–work-related asthma.

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