Four types of COVID-19 vaccines There are four types of COVID-19 vaccines: here’s how they don’t work!The fight against COVID-19 has seen vaccine development move at record speed, with more than 170 different vaccines in trials. But how are they different from each other and how will they protect us against the disease? Subscribe for more videos: http://bit.ly/2VBpGY7 Follow Gavi on social media: Twitter: / gavi Facebook: / gavi Instagram: / gavialliance LinkedIn: / gavi For more about Gavi’s work, visit: http://www.gavi.org