This is a prospective observational study of patients receiving reslizumab to treat their asthma. Some asthma patients receiving reslizumab also have CRS, which might also be improved by this drug. Study measures will be obtained from the medical records of eligible subjects who consent to participate. The study has no specific procedures per se, because all study measures are acquired during the course of standard of care treatment and will be abstracted from those medical records.
