Exposure to a farming environment has allergen-specific protective effects on TH2-dependent isotype switching in response to common inhalants.

Stern DA, Riedler J, Nowak D, et al. "Exposure to a farming environment has allergen-specific protective effects on TH2-dependent isotype switching in response to common inhalants." J. Allergy Clin. Immunol.. 2007;119(2):351-8.