Scientists Uncover Evidence That a Level of Pre-Existing COVID-19 / SARS-CoV-2 Immunity Is Present in the General Population

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SARS-CoV-2-Specific T Cell

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Singapore researchers reveal SARS-CoV-2-particular T cell resistance in recuperated COVID-19 and SARS clients, and in uninfected people.

  • Singapore research study reveals that SARS-CoV-2-specific T cells exist in all recuperated COVID-19 clients.
  • These T cells were likewise discovered in all topics who recuperated from SARS 17 years earlier, and in over 50% of both SARS-CoV-1 and SARS-CoV-2 uninfected people evaluated, recommending that a level of pre-existing SARS-CoV-2 resistance exists in the basic population.
  • Infection and direct exposure to coronaviruses causes lasting memory T cells, which might assist in the management of the present pandemic.

The T cells, in addition to antibodies, are an important part of the human immune reaction versus viral infections due to their capability to straight target and eliminate contaminated cells. A Singapore research study has actually revealed the existence of virus-specific T cell resistance in individuals who recuperated from COVID-19 and SARS, in addition to some healthy research study topics who had actually never ever been contaminated by either infection.

The research study by researchers from Duke-NUS Medical School, in close cooperation with the National University of Singapore (NUS) Yong Loo Lin School of Medicine, Singapore General Hospital (SGH) and National Centre for Infectious Diseases (NCID) was released in Nature. The findings recommend infection and direct exposure to coronaviruses causes lasting memory T cells, which might assist in the management of the present pandemic and in vaccine advancement versus COVID-19.

The group guinea pig who recuperated from COVID-19 and discovered the existence of SARS-CoV-2-specific T cells in all of them, which recommends that T cells play an essential function in this infection. Importantly, the group revealed that clients who recuperated from SARS 17 years earlier after the 2003 break out, still have virus-specific memory T cells and showed cross-immunity to SARS-CoV-2.

“Our team also tested uninfected healthy individuals and found SARS-CoV-2-specific T cells in more than 50 percent of them. This could be due to cross-reactive immunity obtained from exposure to other coronaviruses, such as those causing the common cold, or presently unknown animal coronaviruses. It is important to understand if this could explain why some individuals are able to better control the infection,” stated Professor Antonio Bertoletti, from Duke-NUS’ Emerging Infectious Diseases (EID) program, who is the matching author of this research study.

Associate Professor Tan Yee Joo from the Department of Microbiology and Immunology at NUS Yong Loo Lin School of Medicine and Joint Senior Principal Investigator, Institute of Molecular and Cell Biology, A*STAR included, “We have also initiated follow-up studies on the COVID-19 recovered patients, to determine if their immunity as shown in their T cells persists over an extended period of time. This is very important for vaccine development and to answer the question about reinfection.”

“While there have been many studies about SARS-CoV-2, there is still a lot we don’t understand about the virus yet. What we do know is that T cells play an important role in the immune response against viral infections and should be assessed for their role in combating SARS-CoV-2, which has affected many people worldwide. Hopefully, our discovery will bring us a step closer to creating an effective vaccine,” stated Associate Professor Jenny Low, Senior Consultant, Department of Infectious Diseases, SGH, and Duke-NUS’ EID program.

“NCID was heartened by the tremendous support we received from many previous SARS patients for this study. Their contributions, 17 years after they were originally infected, helped us understand mechanisms for lasting immunity to SARS-like viruses, and their implications for developing better vaccines against COVID-19 and related viruses,” stated Dr Mark Chen I-Cheng, Head of the NCID Research Office.

The group will be performing a bigger research study of exposed, uninfected topics to analyze whether T cells can safeguard versus COVID-19 infection or modify the course of infection. They will likewise be checking out the prospective healing usage of SARS-CoV-2-specific T cells.

Reference: “SARS-CoV-2-specific T cell immunity in cases of COVID-19 and SARS, and uninfected controls” by Nina Le Bert, Anthony T. Tan, Kamini Kunasegaran, Christine Y. L. Tham, Morteza Hafezi, Adeline Chia, Melissa Hui Yen Chng, Meiyin Lin, Nicole Tan, Martin Linster, Wan Ni Chia, Mark I-Cheng Chen, Lin-Fa Wang, Eng Eong Ooi, Shirin Kalimuddin, Paul Anantharajal Tambyah, Jenny Guek-Hong Low, Yee-Joo Tan and Antonio Bertoletti, 15 July 2020, Nature.
DOI: 10.1038/s41586-020-2550-z



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