Medical Definition of Bacillus

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Bacillus: A large family of bacteria that are rod-like in shape. They include the bacteria that cause food to spoil, as well as those that are responsible for some diseases. Helpful members of the bacillus family are used to make antibiotics or colonize the human intestinal tract and aid with digestion.

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Reviewed on 12/27/2018

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