Mike Ryan, the World Health Organization’s health emergencies director, had a conversation recently with his mother, the kind that lots of public health people are having these days, much to their dismay. Ryan’s mother was concerned about one of the Covid-19 vaccines in use in Ireland, where she lives. The one made by AstraZeneca.
Clinical trials had shown the vaccine offered protection against the disease, but less than the vaccine made by Moderna or the one made by Pfizer and BioNTech. Ryan’s mother was worried the vaccine might not be good enough.