TLR1, TLR4, TLR5, TLR8, and TLR9 expression levels were also significantly elevated in severe and critical COVID-19 patients; however, TLR3 expression was not correlated with the development of COVID-19, and an increased expression of TLR7 was observed only in patients with moderate COVID-19 [30]. Here, TLR5 is linked to COVID-19.