Microcheck 166

In most cases, B cells that bind antigen require accessory signals from a T-helper cell to become activated. Activated B cells proliferate, ultimately producing plasma cells, which secrete antibody, and long-lived memory cells. Affinity maturation and class switching occur in the primary response; these enable a swift and more effective secondary response. T-independent antigens can stimulate an antibody response by activating B cells without the aid of T-helper cells.

■ Describe the process of clonal selection.

■ How do B cells increase their ability to bind to antigen?

■ Why should B cells residing in the mucosal-associated lymphoid tissues produce IgA?

Bacterial Vaginosis Facts

Bacterial Vaginosis Facts

This fact sheet is designed to provide you with information on Bacterial Vaginosis. Bacterial vaginosis is an abnormal vaginal condition that is characterized by vaginal discharge and results from an overgrowth of atypical bacteria in the vagina.

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