1. Health Canada. NACI rapid response: recommended use of AstraZeneca covid-19 vaccine in younger adults. 30 March 2021. www.canada.ca/en/public-health/services/immunization/national-advisory-committee-on-immunization-naci/rapid-response-recommended-use-astrazeneca-covid-19-vaccine-younger-adults.html.
2. Star editorial board. Constantly changing guidelines are undermining public trust in all vaccines. 29 March 2021. www.thestar.com/opinion/editorials/2021/03/29/constantly-changing-guidelines-are-undermining-public-trust-in-all-vaccines.html.
3. STIKO press release from 30 March 2021. 2021. www.rki.de/DE/Content/Kommissionen/STIKO/Empfehlungen/AstraZeneca-Impfstoff-2021-03-30.html.
4. European Medicines Agency. Signal assessment report on embolic and thrombotic events with covid-19 vaccine (ChAdOx1-S [recombinant]): Covid-19 vaccine AstraZeneca (other viral vaccines). 24 March 2021. www.ema.europa.eu/en/documents/prac-recommendation/signal-assessment-report-embolic-thrombotic-events-smq-covid-19-vaccine-chadox1-s-recombinant-covid_en.pdf.
5. Greinacher A, Thiele T, Warkentin TE, et al. A prothrombotic thrombocytopenic disorder resembling heparin-induced thrombocytopenia following coronavirus-19 vaccination. Research Square. 29 March 2021. www.researchsquare.com/article/rs-362354/v1.