Medical Dialogues
  • Dermatology
Login Register
This site is intended for healthcare professionals only
Login Register
  • Medical Jobs
  • Medical Matrimony
  • MD Brand Connect
  • MDTV
    • Anesthesia
    • CTVS
    • Cardiology
    • Critical Care
    • Dentistry
    • Dermatology
    • Diabetes and Endocrinology
    • Diet and nutrition
    • ENT
    • Gastroenterology
    • Health Dialogues
    • Health News today
    • Health Shorts
    • Health Updates
    • Health video of the day
    • Laboratory Medicine
    • Latest Videos
    • Latest Webinars
    • MD shorts
    • Medical News Today
    • Medical Updates
    • Medical Video of the day
    • Medicine
    • Medico Legal Update
    • Nephrology
    • Neurology and Neurosurgery
    • Obstetrics and Gynaecology
    • Oncology
    • Ophthalmology
    • Orthopaedics
    • Pediatrics & Neonatology
    • Psychiatry
    • Pulmonology
    • Radiology
    • Surgery
    • Top Videos
    • Urology
Medical Dialogues
  • Medical News
      • Anesthesiology
      • Cardiology and CTVS
      • Critical Care
      • Dentistry
      • Dermatology
      • Diabetes and Endocrinology
      • ENT
      • Gastroenterology
      • Medicine
      • Nephrology
      • Neurology
      • Obstretics-Gynaecology
      • Oncology
      • Ophthalmology
      • Orthopaedics
      • Pediatrics-Neonatology
      • Psychiatry
      • Pulmonology
      • Radiology
      • Surgery
      • Urology
      • Laboratory Medicine
      • Diet
      • Nursing
      • Paramedical
      • Physiotherapy
  • Health news
      • Doctor News
      • Government Policies
      • Hospital & Diagnostics
      • International Health News
      • MCI News
      • Medical Organization News
      • Medico Legal News
      • NBE News
      • NMC News
  • Medical Guidelines
      • Anesthesiology
      • Cardiology and CTVS
      • Critical Care
      • Dentistry
      • Dermatology
      • Diabetes and Endocrinology
      • ENT
      • Gastroenterology
      • Medicine
      • Nephrology
      • Neurology
      • Obstretics-Gynaecology
      • Oncology
      • Ophthalmology
      • Orthopaedics
      • Pediatrics-Neonatology
      • Psychiatry
      • Pulmonology
      • Radiology
      • Surgery
      • Urology
      • Laboratory Medicine
      • Diet
      • Nursing
      • Paramedical
      • Physiotherapy
  • AYUSH
    • Ayurveda
    • Homeopathy
    • Siddha
    • Unani
    • Yoga
  • State News
      • Andaman and Nicobar Islands
      • Andhra Pradesh
      • Arunachal Pradesh
      • Assam
      • Bihar
      • Chandigarh
      • Chattisgarh
      • Dadra and Nagar Haveli
      • Daman and Diu
      • Delhi
      • Goa
      • Gujarat
      • Haryana
      • Himachal Pradesh
      • Jammu & Kashmir
      • Jharkhand
      • Karnataka
      • Kerala
      • Ladakh
      • Lakshadweep
      • Madhya Pradesh
      • Maharashtra
      • Manipur
      • Meghalaya
      • Mizoram
      • Nagaland
      • Odisha
      • Puducherry
      • Punjab
      • Rajasthan
      • Sikkim
      • Tamil Nadu
      • Telangana
      • Tripura
      • Uttar Pradesh
      • Uttrakhand
      • West Bengal
  • Medical Education
      • Ayush Education News
      • Dentistry Education News
      • Medical Admission News
      • Medical Colleges News
      • Medical Courses News
      • Medical Universities News
      • Nursing education News
      • Paramedical Education News
      • Study Aborad
  • Industry
    • Health Investment News
    • Health Startup News
    • Medical Devices News
    • Pharma News
    • Pharmacy Education News
  • MDTV
      • Anesthesia
      • CTVS
      • Cardiology
      • Critical Care
      • Dentistry
      • Dermatology
      • Diabetes and Endocrinology
      • Diet and nutrition
      • ENT
      • Gastroenterology
      • Health Dialogues
      • Health News today
      • Health Shorts
      • Health Updates
      • Health video of the day
      • Laboratory Medicine
      • Latest Videos
      • Latest Webinars
      • MD shorts
      • Medical News Today
      • Medical Updates
      • Medical Video of the day
      • Medicine
      • Medico Legal Update
      • Nephrology
      • Neurology and Neurosurgery
      • Obstetrics and Gynaecology
      • Oncology
      • Ophthalmology
      • Orthopaedics
      • Pediatrics & Neonatology
      • Psychiatry
      • Pulmonology
      • Radiology
      • Surgery
      • Top Videos
      • Urology
This site is intended for healthcare professionals only
LoginRegister
Medical Dialogues
LoginRegister
  • Home
  • Medical news
    • Anesthesiology
    • Cardiology and CTVS
    • Critical Care
    • Dentistry
    • Dermatology
    • Diabetes and Endocrinology
    • ENT
    • Gastroenterology
    • Medicine
    • Nephrology
    • Neurology
    • Obstretics-Gynaecology
    • Oncology
    • Ophthalmology
    • Orthopaedics
    • Pediatrics-Neonatology
    • Psychiatry
    • Pulmonology
    • Radiology
    • Surgery
    • Urology
    • Laboratory Medicine
    • Diet
    • Nursing
    • Paramedical
    • Physiotherapy
  • Health news
    • Doctor News
    • Government Policies
    • Hospital & Diagnostics
    • International Health News
    • MCI News
    • Medical Organization News
    • Medico Legal News
    • NBE News
    • NMC News
  • Medical Guidelines
    • Anesthesiology
    • Cardiology and CTVS
    • Critical Care
    • Dentistry
    • Dermatology
    • Diabetes and Endocrinology
    • ENT
    • Gastroenterology
    • Medicine
    • Nephrology
    • Neurology
    • Obstretics-Gynaecology
    • Oncology
    • Ophthalmology
    • Orthopaedics
    • Pediatrics-Neonatology
    • Psychiatry
    • Pulmonology
    • Radiology
    • Surgery
    • Urology
    • Laboratory Medicine
    • Diet
    • Nursing
    • Paramedical
    • Physiotherapy
  • Medical Education
    • Ayush Education News
    • Dentistry Education News
    • Medical Admission News
    • Medical Colleges News
    • Medical Courses News
    • Medical Universities News
    • Nursing education News
    • Paramedical Education News
    • Study Aborad
  • Industry
    • Health Investment News
    • Health Startup News
    • Medical Devices News
    • Pharma News
      • CDSCO (Central Drugs Standard Control Organisation) News
    • Pharmacy Education News
  • Case of the Day
  • Editorial
  • Home
  • Pulmonology
  • Pulmonology News
  • AstraZeneca vaccine...

AstraZeneca vaccine doesn't protect against South African variant of COVID-19, shows trial

Medha BaranwalWritten by Medha Baranwal Published On 2021-04-01T09:30:43+05:30  |  Updated On 2021-04-01T13:48:20+05:30
AstraZeneca vaccine doesnt protect against South African variant of COVID-19, shows trial
  • Facebook
  • Twitter
  • Whatsapp
  • Telegram
  • Linkedin
  • Email
  • koo
  • Facebook
  • Twitter
  • Whatsapp
  • Telegram
  • Linkedin
  • Email
  • koo
  • Facebook
  • Twitter
  • Whatsapp
  • Telegram
  • Linkedin
  • Email
  • koo

South Africa: Results from a phase 1b-2 clinical trial showed two-dose regimen of the AstraZeneca-Oxford University COVID-19 vaccine to be ineffective against mild-to-moderate COVID-19 due to the B.1.351 variant.The study, published in the New England Journal of Medicine, found that two-dose regimen of the ChAdOx1 nCoV-19 vaccine did not provide protection...

South Africa: Results from a phase 1b-2 clinical trial showed two-dose regimen of the AstraZeneca-Oxford University COVID-19 vaccine to be ineffective against mild-to-moderate COVID-19 due to the B.1.351 variant.

The study, published in the New England Journal of Medicine, found that two-dose regimen of the ChAdOx1 nCoV-19 vaccine did not provide protection against mild-to-moderate infections with the B1351 variant first identified in South Africa. 

Safety and efficacy assessment of vaccines against the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is essential in different population, so is investigation of the efficacy of the vaccines against emerging SARS-CoV-2 variants of concern, including the B.1.351 (501Y.V2).

Shabir A. Madhi and colleagues aimed to assess the safety and efficacy of the ChAdOx1 nCoV-19 vaccine (AZD1222) in people not infected with the human immunodeficiency virus (HIV) in South Africa.

For the purpose, the researchers conducted a multicenter, double-blind, randomized, controlled trial that included participants 18 to less than 65 years of age. They were assigned in a ratio of 1:1 to receive two doses of vaccine containing 5×1010 viral particles or placebo (0.9% sodium chloride solution) 21 to 35 days apart.

Serum samples obtained from 25 participants after the second dose were tested by pseudovirus and live-virus neutralization assays against the original D614G virus and the B.1.351 variant.

The primary end points were safety and efficacy of the vaccine against laboratory-confirmed symptomatic coronavirus 2019 illness (Covid-19) more than 14 days after the second dose.

 2026 HIV-negative adults were enrolled between June 24 and November 9, 2020; 1010 and 1011 participants received at least one dose of placebo or vaccine, respectively. 

Key findings of the study include:

  • Both the pseudovirus and the live-virus neutralization assays showed greater resistance to the B.1.351 variant in serum samples obtained from vaccine recipients than in samples from placebo recipients.
  • In the primary end-point analysis, mild-to-moderate Covid-19 developed in 23 of 717 placebo recipients (3.2%) and in 19 of 750 vaccine recipients (2.5%), for an efficacy of 21.9%.
  • Among the 42 participants with Covid-19, 39 cases (92.9%) were caused by the B.1.351 variant; vaccine efficacy against this variant, analyzed as a secondary end point, was 10.4%.
  • The incidence of serious adverse events was balanced between the vaccine and placebo groups.

"A two-dose regimen of the ChAdOx1 nCoV-19 vaccine did not show protection against mild-to-moderate Covid-19 due to the B.1.351 variant," wrote the authors. 

Reference:

The study titled, "Efficacy of the ChAdOx1 nCoV-19 Covid-19 Vaccine against the B.1.351 Variant," is published in the New England Journal of Medicine.

DOI: https://www.nejm.org/doi/full/10.1056/NEJMoa2102214

NEJM B1351 variant COVID 19 vaccine 
Source : New England Journal of Medicine
Medha Baranwal
Medha Baranwal

    Medha, MSc. Biotechnology

    Medha Baranwal joined Medical Dialogues as an Editor in 2018 for Speciality Medical Dialogues. She covers several medical specialties including Cardiac Sciences, Dentistry, Diabetes and Endo, Diagnostics, ENT, Gastroenterology, Neurosciences, and Radiology. She has completed her Bachelors in Biomedical Sciences from DU and then pursued Masters in Biotechnology from Amity University. She has a working experience of 5 years in the field of medical research writing, scientific writing, content writing, and content management. She can be contacted at  editorial@medicaldialogues.in. Contact no. 011-43720751

    Show Full Article
    Next Story
    Similar Posts
    NO DATA FOUND

    Editorial

    Propranolol and essential tremors: A critical review

    Propranolol and essential tremors: A critical review

    Safeguarding Mental Health of Doctors & How They Can Prevent a Burnout

    Safeguarding Mental Health of Doctors & How They Can Prevent a Burnout

    Analyzing the Role of Levofloxacin in Urinary Tract Infections-A review

    Analyzing the Role of Levofloxacin in Urinary Tract Infections-A review

    Management of Allergic Rhinitis during COVID-19 Pandemic

    Management of Allergic Rhinitis during COVID-19 Pandemic

    Role of Probiotics in recurrent bacterial vaginosis: A review

    Role of Probiotics in recurrent bacterial vaginosis: A review

    View All

    Journal Club Today

    Miniature, implantable nerve coolers effective for targeted pain relief

    Miniature, implantable nerve coolers effective for targeted pain relief

    View All

    Health News Today

    Health Bulletin 2/July/2022

    Health Bulletin 2/July/2022

    View All
    © 2022 All Rights Reserved.
    Powered By: Hocalwire
    We use cookies for analytics, advertising and to improve our site. You agree to our use of cookies by continuing to use our site. To know more, see our Cookie Policy and Cookie Settings.Ok
    X
    X