C. Gubser and others responses elicited upon immunization with modified vaccinia virus Ankara. J Gen Virol 86, 1997–2006. Symons, J. A., Tscharke, D. C., Price, N. & Smith, G. L. (2002). A study of the vaccinia virus interferon-c receptor and its contribution to virus virulence. J Gen Virol 83, 1953–1964. Thompson, J. D., Higgins, D. G. & Gibson, T. J. (1994). CLUSTAL W: improving the sensitivity of progressive multiple sequence alignment through sequence weighting, position-specific gap penalties and weight matrix choice. Nucleic Acids Res 22, 4673–4680. Tscharke, D. C. & Smith, G. L. (1999). A model for vaccinia virus pathogenesis and immunity based on intradermal injection of mouse ear pinnae. J Gen Virol 80, 2751–2755. Tscharke, D. C., Reading, P. C. & Smith, G. L. (2002). Dermal infection with vaccinia virus reveals roles for virus proteins not seen using other inoculation routes. J Gen Virol 83, 1977–1986. Tulman, E. R., Delhon, G., Afonso, C. L., Lu, Z., Zsak, L., Sandybaev, N. T., Kerembekova, U. Z., Zaitsev, V. L., Kutish, G. F. & Rock, D. L. (2006). Genome of horsepox virus. J Virol 80, 9244–9258. 1676 Journal of General Virology 88