Immune System: Why Vaccines Work 🤧 - A Level Biology Learning & Revision

Emma looks at the primary and secondary immune response and the theory behind vaccines. She also looks at the principle of herd immunity. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A Level Biology exam.

Click here for the full course, or visit this link: http://bit.ly/2TaDFD8