SEB content in sinus wash fluids (nasal lavage fluids for the groups of UC-only and healthy controls). Bars stand for SEB content. Data were presented as mean ± SD. *, p < 0.05, compared with the same group at week 0. CRS-only: a group of 12 patients with CRS but not UC. CRS-Pol: a group of 12 patients with CRS and nasal polyposis.