I hope this link between gut bacteria and allergies and the clostridia / peanut allergy link leads to more research and funding in this area.
My DS had severe colonization of citrobacter and another bacteria that I forget, discovered in a private stool sample analysis, treated after several discussions with several GPs with antibiotics (they didn't want to expose him to the risks associated with antibiotics!!!) and afterwards with probiotics specific to the anti biotics he had, advised by a private nutritionist (all at great expense). He grew in the weeks after his treatment, right before my eyes, the improvement was unbelievable.
While I was back and forth to the GP, Immunologist, Allergy consultants, I was repeatedly told that gut problems of this nature are not investigated. I also wanted to have his gut bacteria analyzed afterwards to see if the antibiotics had worked and if the probiotics had worked but was told there are no standards against which to compare the bacteria levels.
This has made me think that I need to look into this area again and see if there is something that we have missed that could be rectified by rebalancing his gut flora.