Scientists in Sweden looked at one million children born between 2001 and 2010. The findings support the theory that conditions that are too clean early in life can increase allergies.
Checked here http://www.dailymail.co.uk/health/article-3300389/Why-having-dog-really-good-child-s-health-exposed-pet-young-age-cuts-risk-asthma-15.html?ITO=1490&ns_mchannel=rss&ns_campaign=1490
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