Anthrax spores (5940425745)

This scanning electron micrograph shows spores from the anthrax vaccine strain of Bacillus anthracis. These spores can live for many years, enabling the bacteria to survive in a dormant state. The spores range in size from 0.5 to 2 micrometers (millionth of a meter).

Credit: J.H. Carr, Centers for Disease Control and Prevention

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