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Antibody responses to SARS-CoV induced by vaccinations with or without pcDNA-IL-2 by different immunization routes in mice. Serum samples (eight per group) were taken 10 days after the final immunization. Data are presented as means ± SDs. Values of ≥2.1 were considered positive by taking into account the absolute ratio of the responses in postimmunization serum/naïve serum.
