This is one of those stories that could be big or it could be a nonsense. The nonsense part is easy. Most medical research is poorly reported by the media. The men and women working at these sites simply lack the IQ to understand the material so they let the researchers write their copy for them. Studies are sent to the media with an executive summary. It is cut and pasted into a “news” story.
The result is a lot of scientific nonsense makes it to the public, but not all of it is bunk. In this case, there’s a growing speculation that germs may play a much bigger role in human health, with regards to issues like heart disease, cancer and Alzheimer disease.