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https://www.med.cuhk.edu.hk/press-releases/t-cell-responses-elicited-by-covid-19-vaccines-comirnaty-and-coronavac-provide-effective-protection-against-severe-disease-from-different-sars-cov-2-variants
https://www.med.cuhk.edu.hk/press-releases/t-cell-responses-elicited-by-covid-19-vaccines-comirnaty-and-coronavac-provide-effective-protection-against-severe-disease-from-different-sars-cov-2-variants
T-cell responses elicited by COVID-19 vaccines Comirnaty and CoronaVac provide effective protection against severe disease from different SARS-CoV-2 variants

T-cell responses elicited by COVID-19 vaccines Comirnaty and CoronaVac provide effective protection against severe disease from different SARS-CoV-2 variants

A recent study conducted by The Chinese University of Hong Kong (CUHK)’s Faculty of Medicine (CU Medicine) found that mRNA vaccines (Comirnaty) and inactivated vaccines (CoronaVac) can elicit effective T-cell responses to Omicron variants, explaining the high effectiveness of vaccines in reducing death and the severity of illness caused by the new Omicron subvariants. Memory T cells for Omicron were found in all vaccine strategies investigated in the study. They were immediately reactivated during a new SARS-CoV-2 infection, indicating long-term protection. This shows that the use of either Comirnaty or CoronaVac can be considered in policies for global COVID-19 control that aim to reduce disease severity and death. Study findings have been published in the leading journal The Lancet Microbe

 

T cells are essential for controlling disease progression

 

Vaccines are used in public health responses to SARS-CoV-2 variants of concern to reduce the incidence of severe disease, for which T-cell responses are essential. T cells reduce virus replication by eliminating virus-infected cells and control disease progression, though they might not be the major immune component that prevents infection. In view of the paucity of data on vaccine-induced T-cell immunity to Omicron, CU Medicine’s research team conducted a study to compare SARS-CoV-2 Omicron-specific T-cell responses in adults vaccinated with Comirnaty or CoronaVac, the two most widely used COVID-19 vaccines in the world.

 

Study findings provide insights for policies for global COVID-19 control 

 

The study recruited 659 participants from three vaccination centres in Hong Kong. They either received two doses of Comirnaty or CoronaVac, with a homologous or heterologous booster or without a booster, or had been infected with any type of SARS-CoV-2. Their blood samples were collected before vaccination, one month after vaccination, and during convalescence for infected people.

 

Here are the key findings:

 

  • Two doses of either Comirnaty or CoronaVac vaccine elicited large Omicron-specific CD4+ and CD8+ T-cell responses compared with the response in people before vaccination, though it is known that two doses of either vaccine fail to induce neutralising antibodies against Omicron.
  • Two doses of Comirnaty induced higher Omicron-specific CD4+ and CD8+ T-cell responses in adults aged 60 years or older than CoronaVac.
  • A third dose of Comirnaty or CoronaVac boosted waning T-cell responses compared with responses before the third dose, but response levels did not exceed those seen one month after the second dose.
  • Memory phenotypes were identified in both CD4+ and CD8+ T cells after two doses of Comirnaty or CoronaVac vaccine, suggesting that both can provide long-term protection.
Professor David Hui

Professor David Hui

Professor David Hui Shu-cheong, Stanley Ho Professor of Respiratory Medicine and Chairman of the Department of Medicine and Therapeutics at CU Medicine, stated, “This is the first large-scale, head-to-head, comparative study on T-cell immune responses elicited by the Comirnaty and CoronaVac vaccines among vaccinated people in the community. Our findings suggest either vaccine can activate T-cell responses to SARS-CoV-2 and its variants, and should be administered across the population, especially those at high risk of complications, like older people.”

 

Notably, memory T cells for Omicron were found in all vaccine strategies investigated in the study. “Memory T cells migrate into tissue and reactivate during a new SARS-CoV-2 infection. Therefore, these T-cell responses might continue to be effective and protective against severe disease from different variants for a long period of time,” explained Professor Hui.

 

Professor Chris Mok Ka-pun, Assistant Professor in The Jockey Club School of Public Health and Primary Care at CU Medicine, added, “Our data also partly explain the mechanism of the vaccine protection induced by CoronaVac, despite its relatively poor Omicron neutralising antibody responses. Even CoronaVac as a booster dose provides a boost to waning T-cell immunity.” 

 

The research was funded by the Hong Kong government’s Health and Medical Research Fund. The original study can be accessed at: https://doi.org/10.1016/S2666-5247(23)00006-X.   

 

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Clinical service
CUHK Discovers an Essential Oncogene in Non-Alcoholic Fatty Liver Disease-Associated Hepatocellular Carcinoma

CUHK Discovers an Essential Oncogene in Non-Alcoholic Fatty Liver Disease-Associated Hepatocellular Carcinoma

Research
CUHK Study Shows Behavioural Activation with Mindfulness Lower Major Depression Risk

CUHK Study Shows Behavioural Activation with Mindfulness Lower Major Depression Risk

Research
Professor YEOH Eng Kiong Delivers a Talk on End-of-life Care in CUHK Medicine’s Mok Hing Yiu Lecture

Professor YEOH Eng Kiong Delivers a Talk on End-of-life Care in CUHK Medicine’s Mok Hing Yiu Lecture

Symposium
CUHK Study Reveals Patients with Recovery of Hepatitis B Still at Risk of Liver Cancer

CUHK Study Reveals Patients with Recovery of Hepatitis B Still at Risk of Liver Cancer

Research
CUHK Announces World’s First Systematic Review of the Global Incidence and Prevalence of Inflammatory Bowel Diseases in the 21st Century Reveals Surge in Hong Kong in past 30 years

CUHK Announces World’s First Systematic Review of the Global Incidence and Prevalence of Inflammatory Bowel Diseases in the 21st Century Reveals Surge in Hong Kong in past 30 years

Research
CUHK Launches World’s First Study Utilizing Retinal Imaging for Alzheimer’s Disease Screening in Chinese Population

CUHK Launches World’s First Study Utilizing Retinal Imaging for Alzheimer’s Disease Screening in Chinese Population

Research
CUHK Sees Atrial Fibrillation-related Stroke Cases 3 Times Higher Over 15 Years

CUHK Sees Atrial Fibrillation-related Stroke Cases 3 Times Higher Over 15 Years

Research
CUHK Announces World’s First Meta-analysis on Prevalence of Helicobacter pylori Infection

CUHK Announces World’s First Meta-analysis on Prevalence of Helicobacter pylori Infection

Research
CUHK Recommends Oral Glucose Tolerance Test for All Pregnant Women Study Reveals Children of Women with Gestational Diabetes Mellitus Have 3-Fold Diabetes Risk

CUHK Recommends Oral Glucose Tolerance Test for All Pregnant Women Study Reveals Children of Women with Gestational Diabetes Mellitus Have 3-Fold Diabetes Risk

Research
CUHK Collaborates with Australian Experts to Untangle Mystery of Eastern Inflammatory Bowel Disease Gut Microbiota

CUHK Collaborates with Australian Experts to Untangle Mystery of Eastern Inflammatory Bowel Disease Gut Microbiota

Research
CUHK Reveals Non-Alcoholic Fatty Liver Disease Afflicts Even the Non-Obese

CUHK Reveals Non-Alcoholic Fatty Liver Disease Afflicts Even the Non-Obese

Research
CUHK Proves Rotavirus Vaccine Highly Effective for HK Children

CUHK Proves Rotavirus Vaccine Highly Effective for HK Children

Research
CUHK Professor Receives World Honour For Stroke Services Pioneering an Innovative 3-in-1 Multi-Target Therapy to Repair Damaged Brain After Stroke and Enhance Functional Recovery

CUHK Professor Receives World Honour For Stroke Services Pioneering an Innovative 3-in-1 Multi-Target Therapy to Repair Damaged Brain After Stroke and Enhance Functional Recovery

Awards and honors
CUHK Discovers Fatty Liver Causing Severe Liver Fibrosis or Cirrhosis in 1 Out of 5 Diabetic Patients

CUHK Discovers Fatty Liver Causing Severe Liver Fibrosis or Cirrhosis in 1 Out of 5 Diabetic Patients

Research
CUHK Opens Therese Pei Fong Chow Research Centre for Prevention of Dementia and Establishes a One-stop Online Platform to Provide Information on Dementia

CUHK Opens Therese Pei Fong Chow Research Centre for Prevention of Dementia and Establishes a One-stop Online Platform to Provide Information on Dementia

Research
CUHK World’s First Study Confirms A New Colorectal Cancer High Risk Group

CUHK World’s First Study Confirms A New Colorectal Cancer High Risk Group

Research
CUHK Asia’s First Comprehensive Epidemiological Study on Health Impact of Household Cleaning Products on Children Reveals Frequent Use of Household Cleaning Products Increase Risk of Triggering Rhinitis in Children

CUHK Asia’s First Comprehensive Epidemiological Study on Health Impact of Household Cleaning Products on Children Reveals Frequent Use of Household Cleaning Products Increase Risk of Triggering Rhinitis in Children

Research
CUHK Sets up the Global First Research Registry on Early Onset Dementia in Chinese Population

CUHK Sets up the Global First Research Registry on Early Onset Dementia in Chinese Population

Research
CUHK and HKU Researchers Introduce 3D Printing Technology in Complex Cardiac Surgery Procedures

CUHK and HKU Researchers Introduce 3D Printing Technology in Complex Cardiac Surgery Procedures

Research
CUHK Jointly Discovers New Therapeutic Solution for Minor Stroke in Global Study with over 30 Countries

CUHK Jointly Discovers New Therapeutic Solution for Minor Stroke in Global Study with over 30 Countries

Research
CUHK Sees Early Evaluation of TIA Patients Reduce Rate of Stroke by 70% in a Global Study of 21 Countries

CUHK Sees Early Evaluation of TIA Patients Reduce Rate of Stroke by 70% in a Global Study of 21 Countries

Research
CUHK Research Shows 1 in 5 Throat Cancer Patients in HK is HPV infected

CUHK Research Shows 1 in 5 Throat Cancer Patients in HK is HPV infected

Research
CUHK Conducts Hong Kong’s First Study on Seven Common Respiratory Viruses Revealing Respiratory Syncytial Virus and Influenza A as Prevalent Fatal Types

CUHK Conducts Hong Kong’s First Study on Seven Common Respiratory Viruses Revealing Respiratory Syncytial Virus and Influenza A as Prevalent Fatal Types

Research
CUHK Screening Reveals 1 in 3 Older Adults in Community Suffer Brain Small Vessel Disease, Early Prevention Recommended

CUHK Screening Reveals 1 in 3 Older Adults in Community Suffer Brain Small Vessel Disease, Early Prevention Recommended

Clinical service
CUHK Latest Research Reveals FMT Effectiveness Triples that of Conventional Treatment

CUHK Latest Research Reveals FMT Effectiveness Triples that of Conventional Treatment

Research
CUHK Introduces High Frequency Oscillations to Determine Resection Margin Increases the Effectiveness of Complex Epilepsy Surgery by around 30%

CUHK Introduces High Frequency Oscillations to Determine Resection Margin Increases the Effectiveness of Complex Epilepsy Surgery by around 30%

Surgical advancement
CUHK Advocates Stringent Control of Cardiovascular Risks for Reopening of Narrowed Brain Arteries - A New Paradigm to Prevent Recurrent Stroke (Available in Chinese only)

CUHK Advocates Stringent Control of Cardiovascular Risks for Reopening of Narrowed Brain Arteries - A New Paradigm to Prevent Recurrent Stroke (Available in Chinese only)

Research
CUHK Latest Research Reveals over 100,000 New Non-alcoholic Fatty Liver Cases in Hong Kong Annually

CUHK Latest Research Reveals over 100,000 New Non-alcoholic Fatty Liver Cases in Hong Kong Annually

Research
CUHK Study Reveals Peer Support Can Reduce Hospital Admission of Distressed Diabetes Patients

CUHK Study Reveals Peer Support Can Reduce Hospital Admission of Distressed Diabetes Patients

Research
Joint Study by CUHK and HKSH Reveals Patients with Comorbid REM Sleep Behavior Disorder and Depression may Suffer from Early-stage Neurodegeneration

Joint Study by CUHK and HKSH Reveals Patients with Comorbid REM Sleep Behavior Disorder and Depression may Suffer from Early-stage Neurodegeneration

Research
CUHK Advocates Atrial Fibrillation Screening and Drug Education to Reduce Risk of Stroke among Elderly

CUHK Advocates Atrial Fibrillation Screening and Drug Education to Reduce Risk of Stroke among Elderly

Clinical service
Screening Reveals Over 50% Community-dwelling Population Aged 65 or above are Pre-frail

Screening Reveals Over 50% Community-dwelling Population Aged 65 or above are Pre-frail

Research
Risk of Diabetes Patients Having Depression Doubles That of the General Public CUHK Advocates Timely Assessment of Diabetes Patients’ Mental Health Conditions

Risk of Diabetes Patients Having Depression Doubles That of the General Public CUHK Advocates Timely Assessment of Diabetes Patients’ Mental Health Conditions

Research
CUHK CGH Distinguished Lecture Series: Vision and Experience Sharing from Public Health England

CUHK CGH Distinguished Lecture Series: Vision and Experience Sharing from Public Health England

Symposium
CUHK CGH Distinguished Lecture Series: South Africa Minister of Health Spoke on Impact of Ebola Epidemic in South Africa and African Continent

CUHK CGH Distinguished Lecture Series: South Africa Minister of Health Spoke on Impact of Ebola Epidemic in South Africa and African Continent

Surgical advancement
Radiotherapy to Head and Neck Raises Risk for Stroke CUHK Proved Effectiveness of Carotid Angioplasty and Stenting

Radiotherapy to Head and Neck Raises Risk for Stroke CUHK Proved Effectiveness of Carotid Angioplasty and Stenting

Research
CUHK and PolyU Jointly Introduce TeleStroke for 24-hour Thrombolysis Service at Prince of Wales Hospital

CUHK and PolyU Jointly Introduce TeleStroke for 24-hour Thrombolysis Service at Prince of Wales Hospital

Clinical service
CUHK Releases Research Results on Employment Status of Hong Kong Chronic Kidney Disease (CKD) Dialysis Patients and Promotes Predialysis Education Programme for Mid to Late Stage CKD patients

CUHK Releases Research Results on Employment Status of Hong Kong Chronic Kidney Disease (CKD) Dialysis Patients and Promotes Predialysis Education Programme for Mid to Late Stage CKD patients

Research
CUHK Conducts Asia's Largest Clinical Study on Life-threatening Infections caused by RSV and Influenza in Hong Kong Adults and Elderly

CUHK Conducts Asia's Largest Clinical Study on Life-threatening Infections caused by RSV and Influenza in Hong Kong Adults and Elderly

Research
CUHK Announces Latest Medical Treatment for Minor Stroke

CUHK Announces Latest Medical Treatment for Minor Stroke

Research
Hong Kong and Macau Among Top Three Regions in Asia-Pacific with the Highest Incidence of Inflammatory Bowel Disease CUHK Establishes Registry to Increase Public Awareness

Hong Kong and Macau Among Top Three Regions in Asia-Pacific with the Highest Incidence of Inflammatory Bowel Disease CUHK Establishes Registry to Increase Public Awareness

Research
CUHK-HCC Score Accurately Predicts Risk of Liver Cancer in Chronic Hepatitis B Patients Receiving Antiviral Therapy

CUHK-HCC Score Accurately Predicts Risk of Liver Cancer in Chronic Hepatitis B Patients Receiving Antiviral Therapy

Research
CUHK and Shanghai Jiao Tong University Discover Genetic Predictor of Diabetes in Chinese Patients

CUHK and Shanghai Jiao Tong University Discover Genetic Predictor of Diabetes in Chinese Patients

Research
CUHK Pioneers the Use of 3D Echocardiography to Identify At-Risk Mitral Valve Prolapse Patients

CUHK Pioneers the Use of 3D Echocardiography to Identify At-Risk Mitral Valve Prolapse Patients

Research
CUHK will hold 'SARS A Decade On: A Conference for the Health Professionals'

CUHK will hold 'SARS A Decade On: A Conference for the Health Professionals'

Symposium
CUHK Research Reveals New Influenza Vaccine Offers More Effective Control over Influenza in Hong Kong

CUHK Research Reveals New Influenza Vaccine Offers More Effective Control over Influenza in Hong Kong

Research
CUHK Advocates Palliative Care for Advanced Dementia Patients with Swallowing Problems

CUHK Advocates Palliative Care for Advanced Dementia Patients with Swallowing Problems

Research
CUHK Develops an Automatic Retinal Image Analysis System to Help Diabetes Patients and Elderly Prevent Stroke

CUHK Develops an Automatic Retinal Image Analysis System to Help Diabetes Patients and Elderly Prevent Stroke

Research
CUHK Green Pioneer Series CUHK Recommends Hong Kong's New Air Quality Objectives Should Not Ignore Coarse Particulate Pollutants

CUHK Green Pioneer Series CUHK Recommends Hong Kong's New Air Quality Objectives Should Not Ignore Coarse Particulate Pollutants

Research
CUHK Urges Widespread Helmet Use and Protective Measures Against Cycling-related Traumatic Brain Injury

CUHK Urges Widespread Helmet Use and Protective Measures Against Cycling-related Traumatic Brain Injury

Research
CUHK Study Reveals High Salt Intake Will Lead to High Blood Pressure and Higher Risk of Stroke

CUHK Study Reveals High Salt Intake Will Lead to High Blood Pressure and Higher Risk of Stroke

Research
CUHK Launches Territory-wide Sleep Health Education Campaign to Promote Healthy Sleep and Healthy School Life

CUHK Launches Territory-wide Sleep Health Education Campaign to Promote Healthy Sleep and Healthy School Life

Health Campaign
CUHK and HKU's Collaborative Research Discovers Novel Epilepsy Genetic Markers

CUHK and HKU's Collaborative Research Discovers Novel Epilepsy Genetic Markers

Research
CUHK Advocates Early Detection of Chronic Kidney Diseases Joined by Leading Nephrologists to Make Sound Recommendations

CUHK Advocates Early Detection of Chronic Kidney Diseases Joined by Leading Nephrologists to Make Sound Recommendations

Research
Opening Ceremony of International Conference on Global Health and Public Health Education and Launching of the CUHK Jockey Club Community Primary Care Programme

Opening Ceremony of International Conference on Global Health and Public Health Education and Launching of the CUHK Jockey Club Community Primary Care Programme

Symposium
CUHK Proves the Potent Efficacy of Stenting for Carotid Artery Narrowing and Cardiac Contractility Modulation for Heart Failure

CUHK Proves the Potent Efficacy of Stenting for Carotid Artery Narrowing and Cardiac Contractility Modulation for Heart Failure

Research
Inauguration Ceremony of CCOU Centre for Disaster and Medical Humanitarian Response (CCOUC) Held Today

Inauguration Ceremony of CCOU Centre for Disaster and Medical Humanitarian Response (CCOUC) Held Today

Education
Three CUHK Scholars Named Croucher Senior Research Fellow 2011-12

Three CUHK Scholars Named Croucher Senior Research Fellow 2011-12

Awards and honors
CUHK Green Pioneer Series Findings on Increasing Trend of Primary NO2 Exhaust Emission Fraction in Hong Kong

CUHK Green Pioneer Series Findings on Increasing Trend of Primary NO2 Exhaust Emission Fraction in Hong Kong

Research

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