Age

18–any

Sex

ALL

Healthy volunteers

Accepted

* other respiratory diseases (e.g., chronic obstructive pulmonary disease \[COPD\]);
* active cigarette smoking or a smoking history of \>10 pack-years;
* active malignancy;
* active pulmonary tuberculosis or active respiratory tract infection;
* use of antibiotics within 4 weeks prior to study enrollment;
* current long-term home oxygen therapy (\>15 hours per day);
* current treatment with monoclonal antibody therapies (e.g., omalizumab, mepolizumab, reslizumab, dupilumab, tezepelumab, or other biologics);
* pregnancy.

Expression of TSLP Isoforms in Asthma