02-21-2007, 06:24 PM
Which one of the following organisms principally infects vascular endothelial cells ?
A Salmonella typhi
B Rickettsia typhi
C Haemophylus influenzae
D Coxiella burnetti
A Salmonella typhi
B Rickettsia typhi
C Haemophylus influenzae
D Coxiella burnetti