Effect of a mutation in the B. burgdorferi hrpA (bb0827) or bb0826 gene on infection of C3H/HeN mice.

aThere is a large number of mice in the control group because the hrpA mutants were initially assessed as part of a larger group of mutants.bValues listed correspond to number of positive cultures/number of sites tested.cFour mice infected with B. burgdorferi 5A4 were chosen as positive controls for organ harvests at day 35.dNumber of positive tissue sites/number of sites tested.