I think a lot of us have been exposed to LOTS of antibiotics. I will only take them when I have a chest infection as that triggers my asthma.
When I was younger the Docs were giving me antibiotics every other week before they finally diagnosed me as asthmatic. I was 7 when they did that, so I had needlessly been given antibiotics for a long time. I know they stuck to alternating between 2 types over that period of time, so there are still other types I can take. I was given a type I hadn't had before and had a pretty bad reaction to them, so I have that to contend with in the future. Sorry I'm rambling
Antibiotics can be good if given for the right things. In the past Dr's were too quick to prescribe them as a fix-anything medicine. We are going to see the effects of that pretty soon.