RT Journal Article SR Electronic T1 No right answer: officials need discretion on whether to allow natural immunity exemptions JF Journal of Medical Ethics JO J Med Ethics FD BMJ Publishing Group Ltd and Institute of Medical Ethics SP medethics-2022-108352 DO 10.1136/medethics-2022-108352 A1 Dorit Reiss YR 2022 UL http://jme.bmj.com/content/early/2022/05/11/medethics-2022-108352.abstract AB