3.1 Unfractionated heparin
The porcine UFHs had the greatest antiviral effect against SARS-CoV-2, with Wockhardt UFH (Clinical Trial batch) having a slightly greater effect with a mean ND50 value of 12.5 μg/ml when compared with Celsus UFH (mean ND50 23 μg/ml). The antiviral activity of bovine UFH (mucosa) was approximately three-fold lower (ND50, 75 µg/ml) than porcine UFH, whereas UFH from bovine lung was approximately 50% lower (ND50, 51 μg/ml).