First in vitro data on AZD3152 shows the investigational COVID-19 long-acting antibody neutralises all known variants of concern identified to date
AstraZeneca will highlight new data across its Vaccines and Immune Therapies portfolio at the 33rd European Congress of Clinical Microbiology & Infectious Diseases (ECCMID), 15 – 18 April 2023, reinforcing its ambition to provide long-lasting immunity for millions of people globally. The company will present 15 abstracts, including four oral presentations, at the event.
Data featuring AZD3152, AstraZeneca’s investigational long-acting COVID-19 antibody, as well as Evusheld (tixagevimab and cilgavimab), Vaxzevria (ChAdOx1-S [Recombinant], formerly AZD1222) in COVID-19 and Beyfortus (nirsevimab) in respiratory syncytial virus (RSV) will be presented. Additional data on AstraZeneca’s growing vaccines and immune therapies pipeline against a variety of pathogens will also be presented.
Iskra Reic, Executive Vice President, Vaccines and Immune Therapies, AstraZeneca, said: “We are excited to share our data at ECCMID this year, reflecting the progress of our Vaccines and Immune Therapies portfolio and our ambition to deliver long-lasting immunity and protect against infectious diseases that affect millions of people around the world. COVID-19 remains of great concern and disproportionately impacts the immunocompromised. Our first in vitro data from our next generation long-acting antibody, AZD3152, show its potential to provide protection to the immunocompromised from all known COVID-19 variants of concern to date.”
The role of long-acting antibodies in protecting against COVID-19
AstraZeneca will present the first in vitro neutralisation data on AZD3152, including activity against past and currently circulating COVID-19 variants.1 An update on the ongoing SUPERNOVA Phase I/III trial evaluating AZD3152 for the prevention of symptomatic COVID-19 in an immunocompromised population will also be presented.2
Three abstracts from the Phase IV VALOR trial assessing real-world effectiveness of Evusheld in immunocompromised adults with mild-to-moderate COVID-19 will be presented, including new analyses on prevention of hospitalisation and death.3-5 Data from a 12-month analysis of the Phase III PROVENT prophylaxis trial will also be presented.6
Pursuing a breakthrough in infant RSV prevention
RSV is a common and highly contagious seasonal virus, infecting nearly all children by the age of two.7,8 As part of the ongoing Beyfortus clinical trial programme, new data from the Phase II MUSIC trial, examining the safety profile and pharmacokinetics (PK) exposures in immunocompromised children aged less than two experiencing a first or second RSV season, will be presented.9 This data adds to the existing body of evidence that reinforce Beyfortus’ consistent efficacy across endpoints and studies of approximately 70-80% efficacy against medically attended RSV Lower Respiratory Tract Disease (LRTD) vs placebo with a single dose.10-14
Additional data on Vaxzevria
AstraZeneca will also present data on its COVID-19 vaccine Vaxzevria, evaluating vaccine generated immunogenicity in the context of hybrid immunity from natural infection – an increasingly common occurrence.15-17
Key AstraZeneca presentations during ECCMID 2023
Evusheld, AZD7442 (tixagevimab/cilgavimab)
Implementation of AZD7442 (tixagevimab/cilgavimab) COVID-19 pre-exposure prophylaxis (PrEP) in the largest HMO in Israel: real-world uptake and sociodemographic and clinical characteristics across immunocompromised patient groups
ePoster flash session, Sat 15 April
Initial use of AZD7442 (tixagevimab/cilgavimab) for pre-exposure prophylaxis (PrEP) in severely immunocompromised patients in the United States: Prevention of deaths and underestimation of effectiveness due to misclassification of medically attended COVID-19
Poster, Mon 17 April
Clinical effectiveness of AZD7442 (tixagevimab/cilgavimab) COVID-19 hospitalization among immunocompromised patients in the US Veterans Affairs health system: Overall and during periods of susceptible vs. resistant omicron variants
Poster, Tue 18 April
Efficacy and safety of a single dose of AZD7442 (tixagevimab/cilgavimab) for prevention of COVID-19: 12-month analysis of the PROVENT phase 3 study
Oral, Tue 18 April
The SARS-CoV-2 monoclonal antibody AZD3152 potently neutralises historical and currently circulating variants
Poster, Mon 17 April
Trial in progress: a Phase I/III, randomised, modified double-blind, placebo- and active-controlled pre-exposure prophylaxis study of the SARS-CoV-2–neutralising antibody AZD3152 (SUPERNOVA)
Poster, Tue 18 April
Vaxzevria (ChAdOx1-S [Recombinant], formerly AZD1222)
Persistently high immunogenicity and between-country differences driven by hybrid immunity from primary-series AZD2816 or AZD1222 (ChAdOx1 nCoV-19) and Omicron infections
Oral, Sun 16 April
Relative effectiveness of a 2nd vs 1st COVID-19 vaccine booster against hospitalisation with severe acute respiratory syndrome (SARS) due to SARS-CoV-2 in high-risk individuals: a test-negative design case-control study (REFORCO) using Brazilian national data
Poster, Mon 17 April
COVIDRIVE: the first public private partnership to conduct pan-European COVID-19 vaccine effectiveness studies
Poster, Mon 17 April
The safety and tolerability of nirsevimab for the prevention of RSV disease in immunocompromised children aged ≤24 months: the open label, Phase 2 MUSIC study
Oral, Sun 16 April
Early V&I science
Collateral fitness and pathogenicity effects on Pseudomonas aeruginosa after antibiotic exposure
Oral, Sun 16 April
In vivo expression of three Staphylococcus aureus mAb combination using mRNA protects mice from S. aureus-induced dermonecrosis
Poster, Mon 17 April
Prevalence of Pseudomonas aeruginosa Psl and PcrV from chronically colonized bronchiectasis patients and the potential of therapeutic targeting with a bispecific monoclonal antibody in this patient population
Poster, Mon 17 April
Preschool-located influenza vaccination: an Italian pilot experience
Poster, Mon 17 April
AZD3152 is an investigational next-generation long-acting antibody (LAAB). AZD3152 has been shown in in vitro studies to have broad and potent neutralising activity across all known SARS‑CoV-2 variants of concern to date.1 AZD3152 was derived from B-cells donated by convalescent patients after SARS-CoV-2 infection. AZD3152 was optimised with the same half-life extension and reduced Fc effector function and complement C1q binding as Evusheld. The extended half-life is expected to confer protection from COVID-19 for six months.18
The ongoing SUPERNOVA Phase I/III trial is evaluating the safety and neutralising activity of AZD3152 for the prevention of symptomatic COVID-19 in adults and adolescents 12 years of age or older. Participants have conditions that cause immune impairment and may not mount an adequate protective response after COVID-19 vaccination and, therefore, are at high risk of developing severe COVID-19 if they were to become infected. The trial is using a novel immunobridging approach to establish the safety and efficacy of AZD3152 building on the established generalised safety and efficacy of Evusheld. AZD3152 is anticipated to be available in 2H 2023, subject to regulatory reviews and trial readouts.
AstraZeneca licensed AZD3152 from RQ Biotechnology in May 2022. Under the licensing agreement, RQ Bio is eligible to receive single digit royalties on sales in addition to potential milestone payments.
Evusheld is a combination of two long-acting antibodies - tixagevimab (AZD8895) and cilgavimab (AZD1061) - derived from B-cells donated by convalescent patients after SARS-CoV-2 infection. Discovered by Vanderbilt University Medical Center and licensed to AstraZeneca in June 2020, the human monoclonal antibodies bind to distinct sites on the SARS-CoV-2 spike protein19 and were optimised by AstraZeneca with half-life extension and reduction of Fc effector function and complement C1q binding.20 The half-life extension more than triples the durability of its action compared to conventional antibodies;21-23 data from the PROVENT Phase III trial show protection lasting six months.24 The reduced Fc effector function aims to minimise the risk of antibody-dependent enhancement of disease - a phenomenon in which virus-specific antibodies promote, rather than inhibit, infection and/or disease.25
Evusheld is authorised in many countries around the world for both pre-exposure prophylaxis (prevention) and treatment of COVID-19.
Beyfortus (nirsevimab) is a single dose long-acting antibody, developed and commercialised in partnership by AstraZeneca and Sanofi using AstraZeneca’s YTE technology. It is designed to protect infants entering or during their first respiratory syncytial virus (RSV) season and for children up to 24 months of age who remain vulnerable to severe RSV disease through their second RSV season. Beyfortus has been developed to offer newborns and infants direct RSV protection via an antibody to help prevent Lower Respiratory Tract Infections (LRTI) caused by RSV. Monoclonal antibodies do not require the activation of the immune system to help offer timely, rapid and direct protection against disease.26
In November 2022, Beyfortus was approved by the European Commission and by the UK Medicines and Healthcare products Regulatory Agency (MHRA) for the prevention of RSV LRTI disease in newborns and infants from birth during their first RSV season. The recommended dose of Beyfortus is a single intramuscular injection of 50 mg for infants with body weight <5 kg and a single intramuscular injection of 100 mg for infants with body weight ≥5 kg.27,28
Beyfortus has also been granted regulatory designations to facilitate expedited development by several major regulatory agencies around the world. These include Breakthrough Therapy Designation by the China Center for Drug Evaluation under the National Medical Products Administration; Breakthrough Therapy Designation from the US Food and Drug Administration; access granted to the European Medicines Agency (EMA PRIority Medicines (PRIME) scheme; and named “a medicine for prioritized development” under the Project for Drug Selection to Promote New Drug Development in Pediatrics by the Japan Agency for Medical Research and Development (AMED).
In March 2017, AstraZeneca and Sanofi announced an agreement to develop and commercialise nirsevimab. Under the terms of the agreement, AstraZeneca leads development and manufacturing activities, and Sanofi leads commercialisation activities and records revenue. Under the terms of the global agreement, Sanofi made an upfront payment of €120m, has paid development milestones of €55m and will pay up to €440m further milestones subject to achievement of certain development and sales-related milestones. The two companies share ex-US costs and profits. Revenue from the agreement is reported as Alliance Revenue and Collaboration Revenue in the Company’s financial statements. Following a revision to the profit-sharing arrangement relating to the development and commercialisation of nirsevimab in the US between AstraZeneca, Sanofi and Sobi, Sobi has entered into a direct relationship with Sanofi, replacing the previous participation agreement with AstraZeneca entered into in November 2018.
Vaxzevria (ChAdOx1-S [Recombinant], formerly AZD1222)
AstraZeneca COVID-19 vaccine was invented by the University of Oxford. It uses a replication-deficient chimpanzee viral vector based on a weakened version of a common cold virus (adenovirus) that causes infections in chimpanzees and contains the genetic material of the SARS-CoV-2 virus spike protein. After vaccination, the surface spike protein is produced, priming the immune system to attack the SARS-CoV-2 virus if it later infects the body.
Vaxzevria is a ‘viral vector’ vaccine, which means a version of a virus that cannot cause disease is used as part of the vaccine, leaving the body knowing how to fight it if it is exposed to the real virus later. This vaccine technology has been used by scientists over the past 40 years to fight other infectious diseases such as the flu, Ebola, and HIV.29
Vaxzevriais estimated according to model outcomes to have helped save over six million lives in the first year of vaccination (8 December 2020 to 08 December 2021).30 Vaxzevriais approved for COVID-19 primary vaccination schedule and first booster on top of a primary schedule in both homologous and heterologous settings, based on an acceptable risk-benefit profile.
Under a sub-license agreement with AstraZeneca, the vaccine is manufactured and supplied by the Serum Institute of India under the name COVISHIELD.
AstraZeneca (LSE/STO/Nasdaq: AZN) is a global, science-led biopharmaceutical company that focuses on the discovery, development, and commercialisation of prescription medicines in Oncology, Rare Diseases, and BioPharmaceuticals, including Cardiovascular, Renal & Metabolism, and Respiratory & Immunology. Based in Cambridge, UK, AstraZeneca operates in over 100 countries and its innovative medicines are used by millions of patients worldwide. Please visit astrazeneca.com and follow the Company on Twitter @AstraZeneca
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1. Francica J et al. The SARS-CoV-2 monoclonal antibody AZD3152 potently neutralises historical and currently circulating variants. Poster presented at: 33rd European Congress of Clinical Microbiology & Infectious Diseases (ECCMID); 17 April 2023; Copenhagen, Denmark
2. Webber C et al. Trial in progress: a Phase I/III, randomised, modified double-blind, placebo- and active-controlled pre-exposure prophylaxis study of the SARS-CoV-2–neutralising antibody AZD3152 (SUPERNOVA). Poster presented at: 33rd European Congress of Clinical Microbiology & Infectious Diseases (ECCMID); 18 April 2023; Copenhagen, Denmark
3. Hayek S et al. Implementation of AZD7442 (tixagevimab/cilgavimab) COVID-19 pre-exposure prophylaxis (PrEP) in the largest HMO in Israel: real-world uptake and sociodemographic and clinical characteristics across immunocompromised patient groups. Poster presented at: 33rd European Congress of Clinical Microbiology & Infectious Diseases (ECCMID); 15 April 2023; Copenhagen, Denmark
4. Taylor S et al. Initial use of AZD7442 (tixagevimab/cilgavimab) for pre-exposure prophylaxis (PrEP) in severely immunocompromised patients in the United States: Prevention of deaths and underestimation of effectiveness due to misclassification of medically attended COVID-19. Poster presented at: 33rd European Congress of Clinical Microbiology & Infectious Diseases (ECCMID); 17 April 2023; Copenhagen, Denmark
5. DuVall S et al. Clinical effectiveness of AZD7442 (tixagevimab/cilgavimab) COVID-19 hospitalization among immunocompromised patients in the US Veterans Affairs health system: Overall and during periods of susceptible vs. resistant omicron variants. Poster presented at: 33rd European Congress of Clinical Microbiology & Infectious Diseases (ECCMID); 18 April 2023; Copenhagen, Denmark
6. Ustianowski A et al. Efficacy and safety of a single dose of AZD7442 (tixagevimab/cilgavimab) for prevention of COVID-19: 12-month analysis of the PROVENT phase 3 study. Oral presentation at: 33rd European Congress of Clinical Microbiology & Infectious Diseases (ECCMID); 18 April 2023; Copenhagen, Denmark
7. Glezen WP et al. Risk of primary infection and reinfection with respiratory syncytial virus. Am J Dis Child. 1986;140(6):543-5463
8. Collins et al. Viral and host factors in human respiratory syncytial virus pathogenesis. Journal of Virology. 2008:2040–2055
9. Mankad VS et al. The safety and tolerability of nirsevimab for the prevention of RSV disease in immunocompromised children aged ≤24 months: the open label, Phase 2 MUSIC study. Oral presentation at: 33rd European Congress of Clinical Microbiology & Infectious Diseases (ECCMID); 16 April 2023; Copenhagen, Denmark
10. Hammitt LL, et al. Nirsevimab for prevention of RSV in healthy late-preterm and term infants. N Engl J Med. 2022;386 (9): 837-846
11. Clinicaltrials.gov. A Study to Evaluate the Safety and Efficacy of MEDI8897 for the Prevention of Medically Attended RSV LRTI in Healthy Late Preterm and Term Infants (MELODY). https://clinicaltrials.gov/ct2/show/NCT03979313. Accessed April 2023.
12. Clinicaltrials.gov. A Study to Evaluate the Safety and Efficacy of MEDI8897 for the Prevention of Medically Attended RSV LRTI in Healthy Preterm Infants. (MEDI8897 Ph2b). https://clinicaltrials.gov/ct2/show/results/NCT02878330. Accessed April 2023.
13. Griffin P, et al. Single-Dose Nirsevimab for Prevention of RSV in Preterm Infants. N Engl J Med. 2020;383: 415-425
14. Simões E, et al. Efficacy of nirsevimab against Respiratory Syncytial Virus lower respiratory Tract infections in preterm and term infants, and pharmacokinetic extrapolation to infants with congenital heart disease and chronic lung disease: A pooled analysis of randomised controlled trials. Lancet Child Adolesc Health. 2023;7(3):180-189
15. Jepson B et al. Persistently high immunogenicity and between-country differences driven by hybrid immunity from primary-series AZD2816 or AZD1222 (ChAdOx1 nCoV-19) and Omicron infection. Oral presentation at: 33rd European Congress of Clinical Microbiology & Infectious Diseases (ECCMID); 16 April 2023; Copenhagen, Denmark
16. Meeraus W et al. Relative effectiveness of a 2nd vs 1st COVID-19 vaccine booster against hospitalisation with severe acute respiratory syndrome (SARS) due to SARS-CoV-2 in high-risk individuals: a test-negative design case-control study (REFORCO) using Brazilian national data. Poster presented at: 33rd European Congress of Clinical Microbiology & Infectious Diseases (ECCMID); 17 April 2023; Copenhagen, Denmark
17. Bollaerts K et al. COVIDRIVE: the first public private partnership to conduct pan-European COVID-19 vaccine effectiveness studies. Poster presented at: 33rd European Congress of Clinical Microbiology & Infectious Diseases (ECCMID); 17 April 2023; Copenhagen, Denmark
18. AstraZeneca Data on File – REF173312
19. Dong J, et al. Genetic and structural Basis for SARS-CoV-2 variant neutralization by a two-antibody cocktail.Nat Microbiol. 2021;6(10):1233-1244
20. Loo YM, et al. AZD7442 demonstrates prophylactic and therapeutic efficacy in non-human primates and extended half-life in humans.Sci Transl Med. 2022;14(635):eabl8124
21. Robbie GJ, et al. A novel investigational Fc-modified humanized monoclonal antibody, motavizumab-YTE, has an extended half-life in healthy adults.Antimicrob Agents Chemother. 2013;57(12):6147-6153
22. Griffin MP, et al. Safety, tolerability, and pharmacokinetics of MEDI8897, the respiratory syncytial virus prefusion F-targeting monoclonal antibody with an extended half-life, in healthy adults.Antimicrob Agents Chemother. 2017;61(3)
23. Domachowske, JB et al. Safety, tolerability and pharmacokinetics of MEDI8897, an extended half-life single-dose respiratory syncytial virus prefusion F-targeting monoclonal antibody administered as a single dose to healthy preterm infants.Pediatr Infect Dis J. 2018;37(9):886-892
25. van Erp EA, et al. Fc-mediated antibody effector functions during respiratory syncytial virus Infection and Disease.Front Immunol. 2019;10(MAR)
26. Centers for Disease Control and Prevention. Vaccines & Immunizations. August 18, 2017.https://www.cdc.gov/vaccines/vac-gen/immunity-types.htm. Accessed April 2023.
27. European Commission. https://www.ema.europa.eu/en/documents/product-information/beyfortus-epar-product-information_en.pdf. Accessed April 2023.
28. Medicines & Healthcare products Regulatory Agency. https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/1119040/Marketing_authorisations_granted_1_-_14_November_2022.pdf. Accessed April 2023
29. Zhang et al. Adenoviral vector-based strategies against infectious disease and cancer. Available at:https://www.tandfonline.com/doi/full/10.1080/21645515.2016.1165908. Accessed April 2023
30. AstraZeneca Data on file Ref – 156573. Data estimates based on model outcomes from separate analyses conducted by Airfinity and Imperial College, United Kingdom
What's in the AstraZeneca vaccine. The AstraZeneca vaccine used a harmless, weakened animal virus (called a viral vector) that contains the genetic code for the coronavirus spike protein. Once this enters the body, it tells your cells to make copies of the spike protein.Does AstraZeneca make vaccines? ›
We are engineering next generation vaccines that have the potential to generate potent and long-lasting immune responses. At the same time, we are pioneering novel approaches to develop highly targeted, long-acting antibodies, optimised with our half-life extension technology.Why is the AstraZeneca vaccine not approved by the FDA? ›
The AstraZeneca COVID-19 vaccine is not yet approved in the United States because the one large-scale trial of the vaccine conducted so far used outdated data. The FDA found that in initial trials, some participants mistakenly got half doses of the vaccine.Is the AstraZeneca vaccine used in the US? ›
AstraZeneca withdraws US COVID vaccine application, shifts focus to antibody treatments. After missing the boat for emergency use of COVID-19 vaccines, AstraZeneca has finally pulled the plug on efforts to sell its shot in the U.S.Has the AstraZeneca vaccine been discontinued? ›
While the Oxford/AstraZeneca vaccine is no longer being offered in the UK, the Medicines and Healthcare products Regulatory Agency (MHRA) still monitors potential side effects from this vaccine. The vast majority of side effects that have been reported for the Oxford/AstraZeneca vaccine are mild and short-term.What are the benefits of AstraZeneca vaccine? ›
The AstraZeneca vaccine is safe and effective at protecting people from the extremely serious risks of COVID-19, including death, hospitalization and severe disease.Can I still have AstraZeneca vaccine? ›
All those who have received a first dose of the AstraZeneca vaccine should continue to be offered a second dose of AstraZeneca vaccine, irrespective of age. The second dose will be important for longer lasting protection against COVID-19.Which COVID vaccine is safest? ›
The Pfizer and Moderna vaccines are strongly recommended as safe and effective at preventing serious illness or death from COVID-19.Is FDA going to approve AstraZeneca? ›
Today, the FDA is announcing that it has found an additional four lots of AstraZeneca COVID-19 vaccine drug substance manufactured at the Emergent facility in Baltimore, Maryland, to be acceptable for use for potential export.Is AstraZeneca vaccine in Japan? ›
About Astrazeneca 200,000 doses have been supplied to local governments in Japan, while 63 million doses have donated overseas, the official added. Japan has predominantly relied on the mRNA-type vaccines developed by Pfizer Inc (PFE. N) and Moderna Inc (MRNA. O) for its COVID inoculations and boosters so far.
The Government of Mexico announces that the AstraZeneca vaccine produced by Mexico and Argentina is now available | Secretaría de Relaciones Exteriores | Gobierno | gob.mx.What is the disadvantage of AstraZeneca? ›
however, the vaccine may be associated with very rare cases of blood clots associated with thrombocytopenia, i.e. low levels of blood platelets (elements in the blood that help it to clot) with or without bleeding, including rare cases of clots in the vessels draining blood from the brain (CVST).Does AstraZeneca vaccine prevent severe COVID? ›
COVID-19 Vaccine AstraZeneca confirms 100% protection against severe disease, hospitalisation and death in the primary analysis of Phase III trials.What are the disadvantages of AstraZeneca COVID vaccine? ›
The most serious side effects are very rare cases of unusual blood clots with low blood platelets, which are estimated to occur in 1 in 100,000 vaccinated people. People should seek medical assistance if they have symptoms.Who is the AstraZeneca vaccine not recommended for? ›
COVID-19 Vaccine AstraZeneca is not recommended for children aged below 18 years. No data are currently available on the use of COVID-19 Vaccine AstraZeneca in children and adolescents younger than 18 years of age.Can you mix AstraZeneca with Pfizer usa? ›
Mixing Pfizer and AstraZeneca vaccines provides strong protection, according to a preliminary study. Administering a first dose of one vaccine and a second dose of the other, in either order, is likely to provide potent protection, the researchers said.Can I take Pfizer after AstraZeneca vaccine? ›
People who received a first dose of the AstraZeneca SARS-CoV-2 vaccine should be offered a second dose of the same product, or one of the Pfizer or Moderna shots, according to new advice from Canada's National Advisory Committee on Immunization (NACI).Is the AstraZeneca vaccine RNA or mRNA? ›
The newly reviewed data makes it clear that both AstraZeneca's vaccine, which is known as a viral vector vaccine, and 'mRNA' COVID-19 vaccines, offer equivalent protection against hospitalisation (91.3-92.5%) and death (91.4-93.3%), regardless of age, with no statistical difference.What is AstraZeneca fully vaccinated? ›
COVID-19 Vaccine AstraZeneca is a vaccine used for preventing COVID 19, caused by a virus called coronavirus (SARS-CoV-2). COVID-19 Vaccine AstraZeneca is given to adults aged 18 years and older. COVID-19 Vaccine AstraZeneca stimulates the body's natural defences (immune system).What is AstraZeneca mRNA? ›
One of our mRNA therapies is designed to stimulate the formation of new blood vessels to protect heart muscle cells (cardiomyocytes) in patients with heart failure or after a heart attack and other ischaemic vascular diseases.
Researchers recorded AstraZeneca's level of protection against hospitalisation at 20 weeks after vaccination as 77%, with Pfizer registered as 92.7% in the same timeframe. The protection efficacy against death was 78.7% and 90.4% for AstraZeneca and Pfizer respectively.What is the difference between traditional vaccines and mRNA vaccines? ›
Traditional vaccines put a weakened or inactivated germ into our bodies. Messenger RNA (mRNA) vaccines, like the Pfizer and Moderna COVID-19 vaccines, teach cells how to make a protein that triggers an immune response if someone gets infected.What are the disadvantages of AstraZeneca vaccine? ›
A very rare adverse event called Thrombosis with Thrombocytopenia Syndrome (TTS), involving unusual and severe blood clotting events associated with low platelet counts, has been reported after vaccination with this vaccine.Is AstraZeneca vaccine still effective? ›
The newly published review demonstrates that any three-dose schedule including the AstraZeneca vaccine was highly effective at protecting against severe Omicron outcomes (84.8%-89.2%*). Three dose schedules including mRNA vaccines showed equivalent effectiveness.