extremely significantP < 0.0001
For extremely significant (****) P < 0.0001; extremely significant (***) 0.0001< P <0.001; very significant (**) 0.001< P <0.01; significant (*) 0.01< P <0.05; not significant (ns) P ≥ 0.05. b Number in brackets is the median survival time in days. c Number of animals in group. d BALB/c.WT vs .