The Virtual cGMP Training Marathon for Vaccine Manufacturing: Principles into Practice took place from 12 Sep to 10 Oct 2023 to continue to provide manufacturers & regulators with a comprehensive array of topics to build understanding of current WHO & international GMP standards, technological advancements, industry practices and regulatory expectations specific to the vaccine manufacturing context. Some of the topics include computer system validation, data integrity, challenges in lyophilization and others. Real world examples and case studies will be used to show how to interpret current and recently new good manufacturing practices requirements from a practical point of view and to implement appropriate approaches.