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Virulence of Francisella tularensis FSC200 (3 mice) and Schu S4 (3 mice) populations, incubated at 4°C for 24 weeks, in the C57BL/6J mouse model. FSC200 and Schu S4 from overnight cultures and an infectious dose of 102 CFU were used as a control (3 mice for each strain) and 0.9% NaCl was used as a negative control (2 mice).
