A-Level Biology - Vaccination & Immunity - Types of Immunity | Herd Immunity (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ *** WHAT'S COVERED *** 1. The main types of immunity * Comparing active immunity (long-term protection, memory cells) and passive immunity (short-term, immediate protection). * Distinguishing between natural and artificial forms of both active and passive immunity. 2. How vaccination works * An explanation of how vaccines stimulate the immune system using safe forms of antigens. * The process of the primary immune response, antibody production, and memory cell formation after vaccination. * The role of booster vaccines in extending immunity. 3. The concept of herd immunity * How vaccinating a large portion of a population protects vulnerable individuals. * A comparison of disease spread in a mostly unvaccinated versus a mostly vaccinated population. 4. Reasons why vaccinations may not completely eliminate a disease * Factors such as individual immune system variations, pathogen mutation (antigenic variability), and issues with vaccination programmes. *** CHAPTERS *** 0:00 Introduction to Vaccination & Immunity 0:25 The Main Types of Immunity: Active vs Passive 1:20 Natural vs Artificial Immunity 1:56 How Vaccination Works 2:34 The Stages of Vaccination and Immune Response 3:21 What is Herd Immunity? 4:47 Why Vaccinations Don't Always Eliminate Disease *** PLAYLISTS *** https://youtube.com/playlist?list=PLidqqIGKox7VzYfPIVt8T09xOLNcolCe4&si=8JmDajxjtba6rdc3 https://youtube.com/playlist?list=PLidqqIGKox7UZ3mWhbHv2aA_1vnbsfRPq&si=q3hEKdA4v7kbfwMe https://www.youtube.com/playlist?list=PLidqqIGKox7UTimdJ3eFcnt6xL9GUt2a6 https://youtube.com/playlist?list=PLidqqIGKox7XPh1QacLRiKto_UlnRIEVh&si=orIUwL3o2jOoiYjT https://youtube.com/playlist?list=PLidqqIGKox7X5UFT-expKIuR-i-BN3Q1g&si=DcihOwUkd9oWbbdp https://youtube.com/playlist?list=PLidqqIGKox7WeOKVGHxcd69kKqtwrKl8W&si=Y8MsO-FK948jnxpS https://youtube.com/playlist?list=PLidqqIGKox7UVC-8WC9djoeBzwxPeXph7&si=-7i5Iq7yOeJrhtu6 https://youtube.com/playlist?list=PLidqqIGKox7VKJD2WxRhoKaI6JGLVean8&si=NH_Q1ujhVgACM2FU #alevel #Biology #study #revision #school #exam #AQA #OCR #Edexcel