Antonia Netzl, Department of Zoology, writes: I research vaccination strategies against SARS-CoV-2, the causative agent of COVID-19. SARS-CoV-2 is a virus that evolves, which means that it changes over time. These changes lead to its escape from immunity that was generated against a previous strain – the evolved strain is too different to be recognized by our immune system. To keep up with virus evolution and ensure continuous protection, SARS-CoV-2 vaccines are regularly updated, similar to...