I started taking abx in 2008 for "adult onset asthma" after a bad chest cold. After several month of abx the "asthma" was gone. It has been 4 years since I had any asthma symtpoms and have needed no asthma medication of any kind all those years. I considered myself 100% asthma-free.
I have been completely off the abx for about a year now and during that year I remained asthma-free... until about a week ago. I had two separate instances of exercise induced asthma incidents. They were mild. But this is how it originally started years ago and got worse.