I have heard of this also and here is the website of heard of it on.
Also there is a clinical trial that you can participate in if you live in the selected areas. Some doctors (as you'll see on the website) won't give you the medicine or won't test you because they don't have the test for the bacteria available.
Anyway, here is the information:
And a link on Dr.Hahn http://www.dean.org/index.php/info/asthma
I should have added something I wanted to email you about before. After suffering with asthma for more than 30 years, I was completely cured of it more than three years ago by a doctor who discovered that some asthma is actually caused by bacteria you get with a cold, flu, bronchitis or pneumonia, that lingers in your tissue after the initial illness has ended. I took Azithromycin for three days, then once a week for twelve weeks and was off all my asthma medication by week 8, and I haven't had any asthma medication or had asthma since. There are a lot of studies out about this, and I'd post them on Earth Clinic, but I know it's geared toward natural treatment.