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  1. The Vaccine Education Center at Children’s Hospital of Philadelphia is excited to announce the release of our second animation showing how COVID-19 vaccines work. This one shows how viral vector vaccines, such as the J&J and AZ vaccines, work. Weakened adenoviruses can be used to deliver a vaccine. In COVID-19 vaccines, instructions to make the SARS-CoV-2 spike protein are delivered to educate the immune system, preparing it for future encounters with SARS-CoV-2. Learn more: http://COVIDVaccineAnswers.org
  2. Thrombotic Thrombocytopenia Syndrome (TTS) has emerged as a new adverse event following immunization in individuals vaccinated with COVID-19 non-replicant adenovirus vector-based vaccines (AstraZeneca COVID-19 ChAdOx-1 vaccine and Johnson & Johnson (J&J) Janssen COVID-19 Ad26.COV2-S vaccine). TTS is a serious and life-threatening adverse event. WHO has issued this interim emergency guidance to increase awareness about TTS in the context of COVID-19 vaccination and help healthcare providers in the assessment and management of potential TTS cases. Knowledge about TTS following vaccination with a COVID-19 adenovirus vector-based vaccine is rapidly evolving. WHO will continue to monitor the situation closely for any changes that may affect this interim guidance and will update the guidance as needed.
  3. Educational video on thrombosis with thrombocytopenia syndrome following adenoviruses vaccines against COVID-19.
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