Using the optimized operating conditions, the same researchers then demonstrated antiviral activity, measured as inhibition of virus entry into the target cells, of the heat-denatured lysozyme against the avian viruses H5N1, H5N6 and H7N1 and also against the virus responsible for the COVID-19 pandemic, with the IC50 in the concentration range of ng/mL. The gene discussed is LYZ; the disease is COVID-19.