Demand of the question Introduction. What are vaccines? Body. How does vaccination work? It’s significance and various challenges for vaccination in India. Conclusion. Way forward. A vaccine is a biological preparation that improves immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism, and is often made from weakened … Continue reading [Answered]Explain how vaccines work? Discuss the significance of vaccination and mention various challenges regarding vaccination in India.