why does asthma lead to more infections?

[ill13632]

I have asthma and noticed I would sometimes get more infections.
why does asthma lead to more infections?  asthma is an autoimmune disease so shouldn't your immune system be stronger or is your IS somehow messed up in asthma?
I was taking a lot of antibiotics, cipro, doxy, amoxicilin and isoprinosine
asthma seems to be allergic since after returning home after a while I had no symptoms for one month until I got sick and started having asthma/sleep apnea

[ill13632]

it's really strange after I went through one 3 week course of 30mg prednisone (30mg-10mg tapered in 3wks) now the 30mg doesn't work for my wheezing!  it's as if I've developed prednisone resistance

[ill13632]

I read that the mucus can cause damage to your airways so it's best to expel as quickly as you can like maybe with dextamorphan or gufalsein

[ill13632]

maybe someone can explain the biochemistry of why asthmatics are prone to more infections and what we can do to fight this?

[ill13632]

thanks everyone for your replies!  
I'm curious though how asthma affects T cell function and things like the balance of gut flora/bacteria

[ill13632]

anyway I am not really sure about the mucus expelling with OTC medications

[LizDragoon2002]

As well as desensitization injections, dust mite allergies are helped with dust-proofing first the bedroom and then the house. Outdoor exercise in clean air improves your health.  

Get someone else to vacuum and dust your bedroom if you can at least twice a year.  Adding mattress protectors and pillow protectors to your bedding can help.  Linens need to be changed at least weekly.  Dustproof your house by removing draperies, carpet and throw pillows.  We like venetian blinds and honeycomb shades.  I mist dusty floors and sweep them with a broom before rev-ving up the dusty vacuum cleaner.  Change vacuum cleaner bags often.  Clothes can be hung in vinyl cases in your closet. Using the internet for other great ideas is helpful.