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A Covid-19 vaccine trialed by Vietnam has produced an antibody response in mice, a researcher at a state-owned pharmaceutical firm declared. Immunogenicity is the ability of a foreign substance, such as an antigen, to provoke an immune response in the body of an animal. The vaccine was first tested on 50 mice last month, though the project had commenced in February. Serum samples from the 50 treated mice were later taken, and sent to the National Institute of Hygiene and Epidemiology on May 15 and May 29 for evaluation.