Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Relative virulence of our M. tuberculosis Erdman and H37Rv strains. Each point represents the mean tubercle count of six rabbits given the same aerosol dose. The slopes of the lines show the number of visible tubercles as a function of the number of bacilli inhaled. The Erdman strain (dashed line) produced more tubercles per bacilli inhaled than did the H37Rv strain (solid line).
