A study involving over 30,000 children has concluded that living with a cat does not correlate with increased asthma symptoms, flare-ups, or compromised lung function. For years, many parents facing their child's asthma diagnosis have felt compelled to remove family pets, particularly cats, based on prevailing medical advice. However, previous research was often limited in scope and relied heavily on parental memory rather than verified medical records.
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The recent study, conducted by Dr. Resthie R. Putri and her team at Karolinska Institutet in Stockholm, followed Swedish children aged four to 17 who had been diagnosed with asthma and an allergy affecting their airways. Utilizing Sweden's comprehensive national records and the new National Cat Register established in 2023, the researchers found that about 10% of the children lived with a cat.
Over a two-year period, the study meticulously tracked asthma exacerbations, defined as serious flare-ups requiring emergency medical attention or multiple uses of rescue inhalers. Among children with cats, approximately 3% experienced flare-ups, a rate that nearly matched the 3% recorded for those without cats. Both groups showed that about 10% had moderate-to-severe asthma. Even after accounting for variables such as age, sex, initial asthma severity, parental asthma history, and local population density, the presence of cats remained statistically insignificant.
Further analysis of lung function was performed on about 1,400 children, revealing nearly identical results between those living with cats and those without in terms of forced exhalation and daily symptom control.
Dr. Putri suggested that widespread exposure to cat allergens in environments like schools and public transport could explain the lack of difference observed between the two groups. Previous studies indicated that asthma flare-ups were more closely linked to actual cat allergies than to the mere presence of cats in a child's home.
While this study underscores the benign impact of cats on children with asthma, it does not eliminate the possibility of allergic reactions to sudden, intense exposure to cat allergens. Importantly, findings regarding cats cannot be generalized to all pets; a related study indicated that cohabitation with dogs may actually increase the risk of asthma flare-ups.
The study offers reassurance to families reconsidering their living arrangements due to asthma diagnoses, highlighting that living with a cat did not appear to exacerbate symptoms in the studied group of children. Researchers acknowledge limitations, such as the potential misclassification of cat exposure and uncertainties regarding specific allergens for each child.
The findings are published in the journal Frontiers in Allergy, and further research is desired to validate these conclusions in other countries.