Virulence is the measure of pathogenicity of a microorganism as determined by its ability to
invade host tissues and to produce severe disease. In the low-dose aerosol guinea pig …

Mycobacterium tuberculosis strains Erdman, H37Rv, and H37Ra, as well as M. bovis (BCG
Tice), were grown on Tween®-albumin, Proskauer and Beck, or American Trudeau Society …

Three virulent strains of Mycobacterium tuberculosis (H37Rv, Erdman, and NYH-27) and two
virulent strains of M. bovis (Ravenel and Branch) were compared in terms of their growth …

Mycobacterium tuberculosis strain CDC 1551 exhibited unusually high levels of infectivity
and virulence during a recent outbreak of tuberculosis in a rural community. Mice infected …

The relative virulence and avirulence of Mycobacterium tuberculosis strains H37Rv and
H37Ra were previously defined using animal infection models. To investigate host species' …

Clinical isolates of Mycobacterium tuberculosis demonstrate significant heterogeneity in
virulence potential in animal models of infection. Isolate CDC1551, for example, has …

The aim of this study was to establish an assay to compare Mycobacterium tuberculosis
strains, and cells grown under different growth conditions, in terms of their ability to cause a …

A strain of Mycobacterium tuberculosis (H37Rv) considered virulent for mice and a strain
(R1Rv) considered relatively avirulent were compared for their ability to survive host …

The lengthy treatment regimen for tuberculosis is necessary to eradicate a small sub-
population of M. tuberculosis that persists in certain host locations under drug pressure …

Background and Methods From 1994 to 1996, there was a large outbreak of tuberculosis in
a small, rural community with a population at low risk for tuberculosis. Twenty-one patients …