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Virulence of the ECTV-Moscow, ECTV-Naval and ECTV-Cornell isolates in BALB/c mice. Groups of five female 5–6 week old mice were subcutaneously infected in the footpad with different doses of ECTV-Moscow (A), ECTV-Naval (B) or ECTV-Cornell (C) (1, 10 and 102 pfu per mouse). Mortality (%), weight (%), swelling of the foot (mm) and signs of illness are represented.
