Immunity and Health

5 min

Defense mechanisms of the human body and medical breakthroughs.

The Core Concept

Immunity is the body's defense against pathogens. Innate immunity is present from birth, while acquired immunity develops after exposure to specific antigens.

Why Study This?

Commonly asked in SSC CGL and Railway NTPC Science sections.
Essential for understanding diseases and modern medical science.
Covers high-frequency topics like Jenner, Fleming, and Vaccines.

Memory Shortcuts

Jenner = Jenner-ation of Vaccines (Father of Vaccination).
Fleming = First antibiotic (Penicillin).
Innate = In-born (Natural defense).

Innate vs. Acquired Immunity

Feature	Innate Immunity	Acquired Immunity
Time of Origin	From Birth	After Birth
Specificity	Non-specific	Highly Specific
Memory	No Memory	Strong Memory

Key Medical Milestones

Antibodies

(Y-shaped Proteins)

Y-shaped Proteins

They neutralize harmful pathogens.

Vaccination

(Active Immunity)

Active Immunity

Stimulates antibody production.

Edward Jenner

(Smallpox Vaccine)

Smallpox Vaccine

Year[ 1796 ]

Developed the first vaccine in 1796.

Penicillin

(First Antibiotic)

First Antibiotic

Year[ 1928 ]

Discovered by Alexander Fleming (1928).

Common Exam Traps

Antibiotics kill virusesAntibiotics only kill bacteria

Viruses do not have metabolic pathways that antibiotics can target.

Vaccines provide passive immunityVaccines provide active immunity

Vaccines make your body produce its own antibodies.

Pasteur discovered Smallpox vaccineJenner discovered Smallpox vaccine

Louis Pasteur is famous for Rabies and Pasteurization.

Check Your Knowledge

Q1.Who is known as the 'Father of Immunology'?

Q2.Penicillin is obtained from which of the following?

Page 39 of 45