1. Hale, T. L.et al. Infect. Immun. 40, 340–350 (1983).
2. Riley, L. W.et al. N. Engl. J. Med. 308, 681–685 (1983).
3. Cross, A. S.et al. J. Infect. Dis. 149, 184–193 (1984).
4. Fleischmann, R. D.et al. Science 269, 496–512 (1995).
5. Blattner, F. R.et al. Science 277, 1453–1461 (1997).