Strong and balanced T cell response: key to controlling SARS-CoV-2 infection without getting COVID-19 強大且平衡的T細胞反應:控制SARS-CoV-2感染而不感染COVID-19的關鍵

中文版谷歌中文翻譯(90% 準確率) | English translation
Buy/Sell Your Domains Here。在這裡購買/出售您的域名
Contact Dr. Lu for information about cancer treatments。聯繫盧博士,獲取有關癌症治療資訊。

News Release 7-Mar-2021

Editor’s note: Do or do not do the following to boost your immunity against infections.

Don’t smoke.
Eat large amounts of fruits and vegetables.
Exercise moderately yet regularly.
Maintain a healthy body weight.
Do not drink alcohol. If you do, drink in moderation.
Have sufficient sleep.
Try to avoid infection, such as not using dirty hands to grab foods
Try to avoid stress.

編者註:做或不做以下事情以增強抵抗感染的免疫力。 別抽煙 多吃水果和蔬菜。 適度但定期運動。 保持健康的體重。 不要喝酒。 如果喝,請適量飲酒。 有充足的睡眠。 盡量避免感染,例如不要用臟手抓食物 。 盡量避免壓力。

Duke-NUS Medical School

Research News

To effectively fight off SARS-CoV-2, the immune system depends on both antibodies and T cells, a type of white blood cell, which work together to eradicate the virus. However, little was known about virus-specific T cells in asymptomatic patients.

“We now know that many people are getting infected with SARS-CoV-2 without realising it, as they stay healthy and don’t develop any symptoms. These asymptomatic infections may provide the key to understanding how the immune system can control the virus without triggering pathological processes,” explained Dr Nina Le Bert, Senior Research Fellow at the Duke-NUS’ Emerging Infectious Diseases (EID) Programme and the co-author of this study.

The study, done in collaboration with Assistant Professor Clarence C. Tam from the NUS Saw Swee Hock School of Public Health, compared the T-cell response in 85 asymptomatic and 75 symptomatic patients who were infected with SARS-CoV-2 around the same time.

They selected the asymptomatic individuals from a group of male workers living in a densely populated dormitory in Singapore where SARS-CoV-2 was actively spreading. The symptomatic patients were selected from cohorts of hospitalised COVID-19 patients with mild to severe symptoms, collected and studied by the Singapore General Hospital, National University Hospital and National Centre for Infectious Diseases. By using a test called rapid whole blood T-cell activation assay, they were able to study both the quantity and characteristics of the T-cell response, providing a snapshot of the cellular immunity of both groups.

The team found that the frequency of T cells recognising different viral proteins of SARS-CoV-2 was similar in both asymptomatic individuals and COVID-19 patients. Yet, their features differed: those patients who were asymptomatic produced higher quantities of IFN gamma and IL-2, which are important for viral control.

“Recently, more and more studies are suggesting that T cells may play a protective role in COVID-19 disease. It would be good news for patients to know that they are developing an efficient cellular immune response after a symptom-free infection. Our study opens the door for further large-scale T-cell testing, which could match the speed of antibody testing,” added Professor Antonio Bertoletti, from Duke-NUS’ EID programme, who is the corresponding author of this study.

“Studies such as this deepen our understanding of the body’s complex immune response to SARS-CoV-2. Such knowledge will be key in evaluating long-term immunity, which in part will guide countries’ exit strategies. This study will hopefully spur greater investment in ways to facilitate and scale T cell analysis so that it, along with antibodies, can become part of any first-line immune response assessment,” said Professor Patrick Casey, Senior Vice-Dean for Research at Duke-NUS.

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