How come I own have this cough since December 2008?

I have had a cough since December of this year. I have be on antiobiotics for bronchitis and for strep throat, neither of these have worked. It is a fairly dry cough however the other day I coughed up some sickly looking flem. Any idea what this could be and why I cant get rid of it? I have asthma and allergies Im thinking it may be this?
Answers:    Well my mom have had a couch since the beginning of April and the doctor said they call it the "100 daytime cough." She still coughs now and then.

But since you said you have asthma, that could probably be it. My asthma is starting to bother me because of spring.
you may be allergic to something... check your house for dust mites or mold.


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