I am pleased more studies are being done to find the relationship between mental and physical illness and agree with the correlation, just not necessarily in that order, The reverse is equally true, infection increases risk of ptsd. Chicken and the egg...
I in no way critique you, but there's some possible issues. Research with people is difficult since ethically it cannot be a controlled study, ruling out other factors.
Just to name a few, they would have to perform every test for underlying infections or health factors and many infections don't have accurate tests. Then choose people for the study that are exactly the same from all results, ruling out any genetic factors. Everyone would also have to be exposed to the exact same bacteria before and during the study.
What I'm saying is that I was told my health was poor because of stress, when in fact my stress was off the charts from a neurological disease. It reminds me when doctors said ulcers were from worrying. Decades later, it turns out bacteria was causing a good amount of them and bleeding ulcers are extremely stressful.
Hopefully, the hot topics of ptsd and suicide will continue to pressure the medical community to find real answers and any relationship between the two is certainly a good.
Thanks for the information!