TSLP and COVID-19: When we examined blood drawn within 7 days of testing positive for COVID-19, we found higher IL-25 levels compared to blood collected after 7 days (39.14 ± 36.44 vs. 26.15 ± 20.31); however, we did not find any significant differences in IL-33 and TSLP levels between the two different blood draw groups (p > 0.05).