The persistence of humoral and cellular immunities more than three decades after smallpox vaccination  S.-H. Kim, S.-G. Yeo, K.-H. Park, J.-W. Bang, H.-B. Kim, N.-J. Kim, Y. Jee, H. Cho, M.-D. Oh, K-W. Choe  Clinical Microbiology and Infection  Volume 13, Issue 1, Pages 91-93 (January 2007) DOI: 10.1111/j.1469-0691.2006.01576.x Copyright © 2007 European Society of Clinical Infectious Diseases Terms and Conditions

Fig. 1 (a) Neutralising antibody titres and (b) vaccinia-specific interferon (IFN)-γ-producing effector-memory responses, grouped according to the length of time since smallpox vaccination. The geometric mean titre (a) or mean (b) is represented by the horizontal lines. Line brackets indicate differences between two groups (Mann–Whitney U-test). Neutralising antibody titres or vaccinia-specific IFN-γ-producing effector-memory responses between periods since smallpox vaccination had p values of 0.01 and 0.85, respectively (Kruskal–Wallis analysis of variance) for the entire distribution. SFC, spot-forming cells; PBMC, peripheral blood mononuclear cells. Clinical Microbiology and Infection 2007 13, 91-93DOI: (10.1111/j.1469-0691.2006.01576.x) Copyright © 2007 European Society of Clinical Infectious Diseases Terms and Conditions