The increase in NETs in COVID-19 was determined by the fact that NET markers were increased in COVID-19 patients, e.g., the levels of cell-free desoxyribonucleic acid (DNA), myeloperoxidase DNA, and citrullinated histone H3, and some of these markers, such as cell-free DNA, correlated with the absolute neutrophil count and acute phase proteins [29]. Here, MPO is linked to COVID-19.