Bacteria may run towards food sources or away from toxins. When running, flagella rotate counterclockwise so that the bacteria moves forward. 

University of Wisconsin - Madison

There are two types of bacterial movements that are facilitated by flagella: 
- Running
- Tumbling

Directional Movement of Bacteria

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

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Running (Bacterial Movement)

Bacteria tumble when they are not moving in a significant forward direction but are repositioning their direction to move. When tumbling, the flagella are moving clockwise and are splayed out.

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