CCL20 and obstructive sleep apnea syndrome: Among individuals who tested positive for COVID−19, those with a moderate to severe risk of OSA exhibited lower levels of salivary MIP-3α/CCL20 (Median 0.205, IQR 0.286) compared to those with a mild OSA risk (Median 0.293, IQR 0.688, p < 0.05).