CCL11 and obstructive sleep apnea syndrome: Furthermore, in COVID-19-positive individuals with a moderate to severe OSA risk, lower levels of serum Eotaxin-1/CCL11 (median 1332.5, IQR 1178) were observed in contrast to those with a mild OSA risk (median 1933, IQR 1210, p < 0.05) (Table 3).