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. Author manuscript; available in PMC: 2012 Sep 9.
Published in final edited form as: Vaccine. 2011 Jan 1;29(39):6802–6809. doi: 10.1016/j.vaccine.2010.12.062

Fig 4.

Fig 4

In vivo protection of V.opt DNA-vaccinated mice treated with PBS, anti-CD8a (dCD8), or anti-CD4 (dCD4) monoclonal antibody prior to lethal challenge. Balb/C mice were challenged with a lethal dose of 80,000 cfu Y. pestis (KIM strain) by intranasal inoculation at one week after the 4th DNA immunization and treated for 5 days with PBS (20 mice), anti-CD8a (15 mice), or anti-CD4 (10 mice) monoclonal antibody. Cumulative survival curves were plotted to show the protection for each group as indicated. The vector control group (20 mice) was included as a negative control. “*” shows the statistical difference, p<0.05 compared to the PBS-treated group.