Not really, Strong bacterial infections, like Lyme have reported also strong Herx that last weeks to months and you can view tons of research behind it. it depends on how widespread the infection gets and how nasty the pathogen is, Yes, candida is famous for having herx reactions as well, also very researched,
Even chronic viral infections have reported a herx reaction. in this same forum the success stories have reported worse symptoms on antivirals before getting better, herx that last months. Herx its not rare at all, Although I agree is not well researched outside Lyme or Candida. (and also syphilis) But it has been reported in all types of infections. including Parasites (Toxoplasma Gondii) so you can assume that Herx it's a very real thing to any pathogen and the inmune system reacts the same.
Also its very wrong to assume that herx should last not more than a couple of days, This depends, on syphilis it last 24 hours after treatment, Lyme can last weeks to months, for example with candida, candida its an extremely opportunistic pathogen when its in viral form and as soon as you feed it, it flares up. you can be in a loop of constant herx by treating it and also having the wrong diet. this could also apply to any pathogen that can self replicate faster than being killed, candida it's a famous one. why this happens?
"The breakdown of the spirochete after the use of antibiotics causes the release of toxins and cytokines. JHR is thought to be caused by an acute inflammatory reaction when cytokines and lipoproteins enter the patient's bloodstream. JHR causes an increase in inflammatory cytokines during the period of exacerbation, including interleukin-6, interleukin-8, and tumor necrosis factor-alpha, which result in the development of body aches, fevers, rashes, nausea and vomiting, and flushing, along with other symptoms. "
https://www.ncbi.nlm.nih.gov/books/NBK557820/ - from a study on shypilis. basically, herx its the body reacting to the toxins released from the pathogen and its own citokines being released to the blood, With this, herx can last as long as there is more infection to get.
I believe also CFSremission talks about herx being a good thing, I believed he said that if actually the probiotics didn´t cause herx, it wasn´t working. I believe the same, specially if you have an active infection caused by a nasty pathogen who releases tons of inflamattory stuff while diying.
I had 3 test. as you, a GI-MAP, which showed very high candida spp, and also candida albicans apart also, so a ton of fungi. Then I did a complete antibody test on candida, and my body has a very high reaction on all 3.
And finally a blood test to check for the FUT2 mutation which seems to be very correlated to chronic candida infections, and yes, I´m a non-secretor :/
So yeah, I disagree with your last stance, if you do react to a probiotic, and you are actually ill, strongly consider the probiotic is causing some type of herx reaction (Of course, test first what its your problem, again, we can go in circles of why you are reacting the way you react, but without actual info on what's causing trouble on your gut, you´re going nowhere), But there is 0 sense why super researched probiotics like Lactobacillus spp or bifidobacterium spp would cause disease. if that were the case, people in general would react to this bacteria, and considering this are bacteria normally found in healthy people, there is no reason that the inmune system would have an abnormal reaction to them, No, Healthy people react good to the probiotic, ill people have bad reactions, this goes in hand with probiotic having antibacterial effects on certain pathogens (like lactobacillus, that increases lactic-acid, which is antimicrobial to a lot of others pathogens).