Types of Immunity & Immunoglobulins

What is Natural Active Immunity?

Immunity that develops when the body produces its own antibodies after infection (example: chickenpox). Long-term or lifelong.

What is Natural Passive Immunity?

Immunity gained from antibodies passed naturally (example: placenta IgG

What is Artificial Active Immunity?

Immunity from vaccination where the body makes its own antibodies (example: MMR vaccine). Long-lasting.

What is Artificial Passive Immunity?

Immunity from pre-made antibodies given medically (example: antivenom

What is the role of IgG?

Most abundant antibody; provides long-term immunity; crosses placenta. Mnemonic: Greatest amount

What is the role of IgA?

Protects mucosal surfaces; found in saliva

What is the role of IgM?

First antibody made in infection; activates complement; large structure. Mnemonic: Massive

What is the role of IgE?

Defends against parasites; involved in allergic reactions. Mnemonic: AllErgy and parasitEs.

What is the role of IgD?

Helps activate B cells; function not fully understood. Mnemonic: Don’t know.