AbstractThe debate between the active immunisation versus the passive immunisation has been the subject of discussion since the start of SARS-CoV-2 pandemic. The second debate was monoclonal antibodies versus the polyclonal antibodies in the passive vaccination, which one is more potent and safer for the patients. Which one is more valuable for the industry and the patient in the same time. This research adopted the polyclonal antibodies with new technique in production to cope with the industry needs and at the same time to achieve the best results for the patients. EG-Covimab-H, is a polyclonal antibodies derived from cultivating Switched memory B-Lymphocytes from convalescent patient (2-6 weeks after testing negative and recovering from moderate to severe infection). The isolated B Lymphocytes are cultivated in special media and antibodies were harvested and used in this research. The research focus on testing the tissue toxicity and ability of EG-Covimab-H in neutralizing the SARS-CoV-2 Virus that infected the tissue culture. Tissue culture was done on VERO-6 Cells. EG-Covimab-H was tested for 120 hours on different dilutions (1/2, 1/4, 1/8, 1/16, 1/32, 1/64, up to 1/2056). The result of the toxicity test showed 90-100% safety in the dilution of 1/8 and 1/16 respectively. Therefore, the efficacy test was done with the safe dilution and in the same dilution algorithm. The result came as effectiveness is 95%- 96% success in neutralizing the virus within 96 hours. The neutralization curve did not show any surge in the number of virus copies after applying the polyclonal antibodies and the decline in the number started to show within 48 hours.