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Survival of previously naïve and memory-immune B6 and C3.SW-H2b/SnJ mice following respiratory infection with M. tuberculosis. Age- and gender-matched control (open symbols) or memory-immune (closed symbols) B6 (squares) and C3.SW-H2b/SnJ (C3Hb) (circles) mice were infected by the respiratory route with M. tuberculosis and their survival monitored. Numbers of days after the second aerosol infection are shown. The arrow corresponds to day 111 in Fig. 2. *, memory immune.
