CTSB and COVID-19: They demonstrated inhibition of viral infection, targeting the viral papain-like cysteine protease with low and micromolar potency [69]; still, we can cite the Cobrotoxin, from the Naja naja atra snake, which could be a candidate for alternative therapy for COVID-19 because it may have an inhibitory role on the cytokine storm caused by SARS-CoV-2 in COVID-19 [70].