bacteria vt1240 ( original smooth strain ) , vt1241 ( rough mutant ) and vt 2240 ( reca56 mutant ) were shown to be complement-sensitive when treated with 1.5 x 10 ( 8 ) -- 1.9 x 10 ( 8 ) cells per ml of normal human serum , while the cells with sos-activated system ( reca441 mutant , strain vt3251 ) retained their viability .
C0009498
complement
C0229671
serum