Well I know what our genetics doctor told us that the boys both are more prone to Auto immune disorders, Asthma and leaking gut syndrome due to the Autism.
I have read alot of information at variuos resources about it. Try to Google infections or Auto immune disorders and Autism Disorders.

My oldest got soooo many ear infection when he was younger and he has always had issues with diarrhea.He also has allergies and asthma.

My youngest has asthma issues and CROUP over and over..and he has severe reflux.

Brock was hospitalized with viral meningitis when he was 5 days old. The scariest week of my life, we almost lost him. He was always sick with some sort of viral infection, the doctor always prescribed antibiotics for, but that was before we know he was autistic. We switch doctors when I began to realize the there was something not right about Brock, and his health greatly improved. A little more than quiescence, in my own opinion.

It seems since Logan started school he has been sick alot more often, everyone says thats typical of school age kids. I get concerned because Logan seems to hold on to colds.. the coughing runny nose never seems to go away, We thought it might be allergies so we started giving him claritin, seems to make the red eyes and itchy nose go away but he is still coughing and running at the nose.. I am told it is common.. nothing is common with an autistic child.. maybe I worry to much

My son used to have several (over 10) infections a year. Taking him off casein and gluten helped (especially no dairy).

for a while last year lia seemed to pick up every virus going , was just getting over one and came down with another, started giving her echinaccea from the health store, it works by boosting the immune system , and there has been a vast improvement, coincidence maybe, but its worth giving it a try

My guess would be that so many AS kids are finicky about food that a lot of the good stuff to keep up their immune systems they won't eat. How many times have we read on the boards about the kids that won't eat any fruit or vegetables, or only one kind? I am lucky enough not to have this problem. My AS son is picky, but fruits and vegetables themselves are not the problem. It's the textures and flavors more than anything. Oh yeah, and it can't make his fingers messy. My oldest daughter used to get an ear infection every 45 days for her first 3 years. At 2, they wanted to do tubes but I was adamant about her growing out of it and she did. Also, remember that with allergies can come sinus issues so even if you give something for the itching and watery eyes, the sinuses are still draining down the back of the throat which will cause a hacking cough. I have taken my daughter (the AS's twin) to the doctor at least 4 times because I thought she had croup she was hacking so bad. It was her sinuses, and this is the kid that would eat nothing but fruit and veggies if that's all I bought. And going to school does make it worse. I think the best thing we can do is try to get as much natural immunity in them as possible. Whatever you can get them to eat, even if it's applesauce every day. I also cheat, bad. I know I shouldn't rationalize this but I'm sure you will agree sometimes we take what we can get. When my kids were a bit smaller, the only candy I would really let them eat were Starburst and Skittles because they had a healthy amount of Vit. C. I buy them Fruit roll ups, gushers, kool aid, and anything else that has a vitamin or mineral in it that they will eat now for the same reason. You may have to improvise. Anybody else got ideas, I'm still open too.