Your faeces, my furry friend, are blowin' in the wind

Most winter airborne bacteria in three US cities originates from canine faeces

source: New Scientist vol 211 no 2825, August 13 2011 p16

Most winter airborne bacteria in three US cities originate from canine faeces, according to Noah Fierer, from Colorado University, Boulder. He and his team used DNA analysis to test air from Chicago, Detroit and Cleveland. Summer air includes bacteria from tree leaves, soil and dog faeces. Winter air has less bacteria, since there are fewer leaves, and ice and snow may cover soil. The bacteria are at low concentrations, so unlikely to give rise to disease in humans.
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