Eliminating the bacteria has helped increase platelet count in some people, but the results for this therapy are inconsistent and need to be studied further.

CNN: Idiopathic thrombocytopenic purpura (ITP)

Participants making a full smile performed better than the polite-smile group, but the difference wasn't statistically significant and needs to be studied further, she says.

WSJ: Stress-Busting Smiles

The results, published online in the journal mBio by researchers at Columbia's school of public health, need to be studied further, but suggest Sutterella may be important in understanding the link between autism and digestive ailments, the authors wrote.

WSJ: A Gut Check for Many Ailments

Mike O'Donovan, Chief Executive of the MS Society, said the results would be studied with interest by those involved in MS rehabilitation and they looked forward to seeing the outcome of further research.

BBC: Brain has great recovery powers