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.
This illustration depicts a three-dimensional (3D) computer-generated image of a cluster of rod-shaped, drug-resistant, Mycobacterium tuberculosis bacteria, the pathogen responsible for causing the disease tuberculosis (TB). The artistic recreation was based upon scanning electron microscopic (SEM) imagery.
To receive email updates about this page, enter your email address: