Do asthma and allergy influence subsequent pet keeping? An analysis of childhood and adulthood

Cecilie Svanes*, Jan Paul Zock, Josep Antó, Shyamali Dharmage, Dan Norbäck, Matthias Wjst, Joachim Heinrich, Deborah Jarvis, Roberto de Marco, Estel Plana, Chantal Raherison, Jordi Sunyer, Early Life Working Group of the European Community Respiratory Health Survey the Early Life Working Group of the European Community Respiratory Health Survey

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)

Abstract

Background: Asthma and allergy might influence the choice of keeping pets, leading to apparent protective effects of pets on allergic disease. Objective: We investigated the effects of asthma and allergy on subsequent pet keeping in childhood and adulthood. Methods: Information about asthma and pet keeping at ages 0 to 4, 5 to 15, 20 to 44, and 26 to 56 years was provided by 9812 subjects participating in the 9-year follow-up of the European Community Respiratory Health Survey. Results: In childhood asthma debut at younger than 5 years was associated with less cat keeping at 5 to 15 years (odds ratio [OR], 0.60; 95% CI, 0.44-0.82), an effect only observed when the parents did not have asthma or allergy (P interaction = .045). Childhood asthma did not influence adult pet ownership, unless there were adult symptoms. Adults less often acquired cats at follow-up if they had 3 or more asthma symptoms (OR, 0.78; 95% CI, 0.64-0.95), were taking asthma medication (OR, 0.48; 95% CI, 0.31-0.74), had hay fever (OR, 0.75; 95% CI, 0.62-0.91), had atopy (OR, 0.75; 95% CI, 0.61-0.91), or had specific IgE to cat (OR, 0.57; 95% CI, 0.39-0.82) at baseline. Adults who already had pets usually continued keeping the same type of pet, except that the presence of 3 or more asthma symptoms was associated with less subsequent dog keeping (OR, 0.69; 95% CI, 0.53-0.89). Pet removal between surveys to reduce allergen was reported by 4.7%. Conclusion: Selective avoidance subsequent to asthma or allergy was observed for childhood cat keeping and adult cat acquisition. Avoidance would produce an apparent protective effect of cats on childhood asthma (large OR, 0.83). Avoidance was generally not observed for dogs or birds. Clinical implications: A part of the protective effects of childhood cats on asthma and allergy can be attributed to selective avoidance.

Original languageEnglish
Pages (from-to)691-698
Number of pages8
JournalJournal of Allergy and Clinical Immunology
Volume118
Issue number3
DOIs
Publication statusPublished - Sep 2006
Externally publishedYes

Keywords

  • allergy
  • asthma
  • atopy
  • birds
  • cats
  • dogs
  • ECRHS
  • pets
  • Selective avoidance

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