The term used to describe white blood cells migrating toward bacteria is chemotaxis.

Here's why:

* Chemotaxis is the movement of cells in response to chemical signals.

* Bacteria release chemical signals (chemoattractants) that attract white blood cells, like neutrophils and macrophages.

* These white blood cells then move towards the bacteria to engulf and destroy them, a process called phagocytosis.

So, chemotaxis is the specific mechanism that drives white blood cells to the site of bacterial infection.