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Hygiene Hypothesis – Asthma Kids Columbus

If you cope with Asthma Kids Columbus, you probably wonder how it developed in your child. Doctors and researchers are studying the issue and you have probably heard of the “hygiene hypothesis.” It’s certainly interesting and for Asthma Kids Columbus, important research. Dr. Joseph Bullock wants to share this research from Allergy Watch (Volume 18, […]

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If you cope with Asthma Kids Columbus, you probably wonder how it developed in your child.

Doctors and researchers are studying the issue and you have probably heard of the “hygiene hypothesis.” It’s certainly interesting and for Asthma Kids Columbus, important research.

Dr. Joseph Bullock wants to share this research from Allergy Watch (Volume 18, Number 1, January/February 2016) on children in Sweden.

Read on!

Allergy Watch Article – Asthma Kids Columbus

Questions remain about the effects of early exposure to pets and the risk of developing childhood asthma. Studies of exposure to farm animals have been more consistent than studies of pets. The effects of dog and farm animal exposure on childhood asthma were assessed using Swedish national registry data.

The analysis included more than 1 million children born with asthma from 2001 through 2010. Birth registry data were linked to other records including: data and farm registration, asthma diagnosis and medications, and potential confounders for parents and children. Outcomes of interest were current diagnosis of asthma at age 6 for school-aged children and incident asthma at age 1 to 5 for preschool-aged children. Follow-up data was analyzed from 2007-2012.

Exposure to dogs was recorded for 14.2% of preschool-aged children and 8.2% of school-aged children. Rates of farm animal exposure were 0.5% and 0.3%, respectively. In the preschool-aged cohort, 5.0% of children had an asthmatic event before baseline. During follow-up, there were 28,511 cases of asthma during 906,071 years at risk, for an incidence rate of 3.1 cases per 1,000 years at risk. In the school-aged cohort, 4.2% of children had an asthmatic event during the seventh year of life.

Dog exposure during the first year of life was associated with a lower risk of asthma in school-aged children, odds ratio 0.87; and in preschool-aged children aged 3 years of older, hazard ration 9.90. There was no effect in children under age 3. Farm animal exposure was associated with a reduced risk of asthma in both groups: OR 0.48 in preschool children and HR 0.69 in school-aged children.

These nationwide data suggest a reduced risk of asthma in 6-year-olds with a history of exposure to dogs and farm animals. The association remains significant after considering parental asthma or whether the child was first-born. The evidence may be useful in discussion whether and when infants and young children should be exposed to animals.

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