Biodistribution of 64Cu labeled bacteria. The distribution of 64Cu labeled F. tularensis subsp. novicida was compared to 64Cu labeled K. pneumoniae, 64Cu labeled E. coli and 64Cu labeled LVS in each tissue at 20 hrs pi. The data represent an average of 3 – 9 mice per infection and are given as %ID/g of tissue. The data obtained for each of the tissues sampled 20 hrs p.i from mice infected with F. tularensis subsp. novicida was compared statistically to the same tissue when inoculated with 64Cu labeled K. pneumoniae and E. coli at 20 hrs p.i by using a two tail Student's t-test [e.g. lung (i.n) to lung (i.g)]. * = p < 0.05, ** = p < 0.01 and *** = p < 0.005.