Views: Visits 7 By Sola Ogundipe The World Health Organisation, WHO Regional Office for Africa has clarified the issue of expiry dates of COVID-19 vaccines in general, and specifically on AstraZeneca vaccine doses produced by the Serum Institute of India, SII, also known as Covishield. According to WHO, vaccines, like all other medicinal products, come with a date of expiry and shelf-life determined by the manufacturer and approved by regulatory authorities. Given the urgency of the COVID-19 pandemic, initial emergency use authorization on a number of COVID-19 vaccines, includ...