Possibly a chronic "Infectious mononucleosis",Serology would help here to confirm.Should settle with out problem, but then do consult your doc.
You mentioned low functioning autistic, what medication are you giving him. Did you do research on the side affects. I am not a Dr. but I have seen in my years that a lot of children are misdiagnosed with ADHD or Autism and the medication they were giving including side affects made them physically and mentally disabled.
Children grow up differently, and you have to look at house hold composition, house hold and community environment. Some children are slow learners, some children are quiet and shy. Everyone has different qualities and ways about them selves. I would research side affects on the medication you are giving your child. The first comment I would definitely look at because that is from a Dr. My comment it just FYI to look at on the side
There's an article that you will find of particular interest titled:
--"Systemic Bacteriall Infections (Mycoplasma, Chlamydia, Borrelia species
in Neurodegenerative (MS,ALS) and Behavioral Disorders (ASD)"--
The author of this article is Dr. Garth Nicolson, who happens to be also a part time contibutor here in MedHelp and an expert in Pathogenic Mycoplasma Infections and Co-infections.
Has your son had any genetic testing ? MTHFR genetic mutations like 1298 and 677 are very common in ASD and their main negative effect
is under-methylation, which you might already be familiar with.
And if you're not, perhaps it be of great educational value, to look into this,
as methylation affects a great number of functions (the majority) in the body.
Most Doctors, treating Autistic patients, have not explored this field much,
so this potentially prevents some of their patients from making notable progress.
I personally have a minor methylation deficiency, which I self-treat successfully with MethylSulfonylmethane supplementation.
You probably meant " and is it possible to have a cluster of enlarged lymph nodes withOUT having an infection or cancers?"
And the short answer to this is Yes, however the greater likelihood is the presence of an underlying low grade pathogenic infection, which BTW could be very difficult to detect using standard blood tests if it is Pathogenic Mycoplamsma or one of its coinfections such as: Babesia, Bartonella,
Ehrlichia, Borrelia, HHV6.
Another fact to bear in mind is that siginificant viral loading is common in
autism, which often tends to be cyclical ( acive-inactive phases).
Other factors to consider are:
1. Low cholesterol levels leading to hormonal deficiencies (including vitamin D3 which is a hormone) and sub-optimal neurological function.
2. Yeast overgrowth/ Candida
3. Heavy metals toxicity
4. Nutritional, vitamin and mineral (blood and/or tissue) deficiencies.
5. Food allergies, sensitivity and intolerance.
If you need more details, let me know, however, please note that my comments and suggestions do not constitute medical advice.
Best,
Niko