IL6 and susceptibility to pneumonia measurement: Furthermore, a negative correlation of reduced serum ChE activity was observed in COVID-19 patients with inflammatory markers C-reactive protein and interleukin 6 [13] as well as with COVID-19-induced pneumonia severity and mortality [14]. Functionally, pseudo-ChE activity reflects the integrity of cholinergic anti-inflammatory pathways and neuronal responses to various medications [5-9].