PubMed - search for articles. ** Note that this is not a comprehensive search as references may appear in other databases.
Coronavirus Vaccine Tracker - New York Times - tracking the status of all vaccines that have reached trials in humans, along with a selection of promising vaccines still being tested in cells or animals
Editorial. Assessing a Rare and Serious Adverse Event Following Administration of the Ad26.COV2.S Vaccine - JAMA - 30 April 2021
...US Case Reports of Cerebral Venous Sinus Thrombosis With Thrombocytopenia After Ad26.COV2.S Vaccination, March 2 to April 21, 2021 - JAMA - 30 April 2021
Use of the AstraZeneca COVID-19 vaccine: JCVI statement. Statement from the Joint Committee on Vaccination and Immunisation (JCVI) on the use of the AstraZeneca COVID-19 vaccine - England. Department of Health and Social Care - 7 April 2021