"Twenty percent of attacks were improved on placebo,which is air, and 78 percent of attacks were improved on oxygen, a clear difference in favor of oxygen,"

VOA: standard.2009.12.17

Exactly how the differences in bacteria might make vaginally born babies less prone to allergies and asthma isn't yet clear, but it does point to a difference that researchers can look at going forward.

VOA: standard.2010.06.30