What are the types of immunity?

Immunity is mainly classified into two major types:

1. Natural immunity

2. Acquired immunity

These types help protect the body from diseases and harmful microorganisms.

1. Natural Immunity

Natural immunity is the immunity a person has naturally without medical treatment or vaccination.

It may be:

• Present from birth

• Developed after recovering from an infection

Types of Natural Immunity

a) Innate Immunity

• Present from birth

• Provides general protection against pathogens

Examples:

• Skin barrier

• White blood cells

• Stomach acid

b) Naturally Acquired Immunity

• Develops after infection and recovery

• The body remembers the pathogen for future protection

Example:
Immunity after recovering from chickenpox.

2. Acquired Immunity

Acquired immunity develops during life due to exposure to antigens or through medical methods.

Types of Acquired Immunity

a) Active Immunity

The body produces its own antibodies.

It develops through:

• Vaccination

• Natural infection

Example:
Immunity after taking a polio vaccine.

b) Passive Immunity

Ready-made antibodies are transferred to the body.

Examples:

• Antibodies from mother to baby through breast milk

• Injection of antibodies during emergencies

Passive immunity provides immediate but temporary protection.

Comparison of Immunity Types

Type	Source	Duration
Natural immunity	Birth or infection	Usually long-lasting
Acquired active immunity	Vaccination or infection	Long-lasting
Acquired passive immunity	External antibodies	Temporary

Importance of Immunity Types

Different types of immunity help:

• Prevent infections

• Protect the body from repeated diseases

• Support public health through vaccination

Understanding immunity is important for disease prevention and healthy living.