COVID-19: The immune system can fight back

Summary: Australian researchers have mapped immune responses from one of the country’s first COVID-19 patients. The findings shed light on how the immune system fights the virus and assists in recovery from the virus.

Source: University of Melbourne

Melbourne researchers have mapped immune responses from one of Australia’s first novel coronavirus (COVID-19) patients, showing the body’s ability to fight the virus and recover from the infection.

Researchers at the Peter Doherty Institute for Infection and Immunity (Doherty Institute) – a joint venture between the University of Melbourne and the Royal Melbourne hospital – were able to test blood samples at four different time points in an otherwise healthy woman in her 40s, who presented with COVID-19 and had mild-to-moderate symptoms requiring hospital admission.

Published today in Nature Medicine is a detailed report of how the patient’s immune system responded to the virus. One of the authors on the paper, research fellow Dr Oanh Nguyen said this was the first time that broad immune responses to COVID-19 have been reported.

“We looked at the whole breadth of the immune response in this patient using the knowledge we have built over many years of looking at immune responses in patients hospitalised with influenza,” Dr Nguyen said.

“Three days after the patient was admitted, we saw large populations of several immune cells, which are often a tell-tale sign of recovery during seasonal influenza infection, so we predicted that the patient would recover in three days, which is what happened.”

The research team was able to do this research so rapidly thanks to SETREP-ID (Sentinel Travellers and Research Preparedness for Emerging Infectious Disease), led by Royal Melbourne Hospital Infectious Diseases Physician Dr Irani Thevarajan at the Doherty Institute.

SETREP-ID is a platform that enables a broad range of biological sampling to take place in returned travellers in the event of a new and unexpected infectious disease outbreak, which is exactly how COVID-19 started in Australia.

“When COVID-19 emerged, we already had ethics and protocols in place so we could rapidly start looking at the virus and immune system in great detail,” Dr Thevarajan said.

“Already established at a number of Melbourne hospitals, we now plan to roll out SETREP-ID as a national study.”

Working together with University of Melbourne Professor Katherine Kedzierska, a laboratory head at the Doherty Institute and a world-leading influenza immunology researcher, the team were able to dissect the immune response leading to successful recovery from COVID-19, which might be the secret to finding an effective vaccine.

“We showed that even though COVID-19 is caused by a new virus, in an otherwise healthy person, a robust immune response across different cell types was associated with clinical recovery, similar to what we see in influenza,” Professor Kedzierska said.

This shows COVID 19
Dr Thevarajan said that current estimates show more than 80 percent of COVID-19 cases are mild-to-moderate, and understanding the immune response in these mild cases is very important research. The image is in the public domain.

“This is an incredible step forward in understanding what drives recovery of COVID-19. People can use our methods to understand the immune responses in larger COVID-19 cohorts, and also understand what’s lacking in those who have fatal outcomes.”

Dr Thevarajan said that current estimates show more than 80 per cent of COVID-19 cases are mild-to-moderate, and understanding the immune response in these mild cases is very important research.

“We hope to now expand our work nationally and internationally to understand why some people die from COVID-19, and build further knowledge to assist in the rapid response of COVID-19 and future emerging viruses,” she said.icine, “and we hoped that it would go away before it reached us.”

About this SARS-CoV-2 research article

Source:
University of Melbourne
Media Contacts:
Catherine Sommerville – University of Melbourne
Image Source:
The image is in the public domain.

Original Research: Open access
“Breadth of concomitant immune responses prior to patient recovery: a case report of non-severe COVID-19”. Irani Thevarajan, Thi H. O. Nguyen, Marios Koutsakos, Julian Druce, Leon Caly, Carolien E. van de Sandt, Xiaoxiao Jia, Suellen Nicholson, Mike Catton, Benjamin Cowie, Steven Y. C. Tong, Sharon R. Lewin & Katherine Kedzierska.
Nature Medicine doi:10.1038/s41591-020-0819-2.

Abstract

Breadth of concomitant immune responses prior to patient recovery: a case report of non-severe COVID-19

We report the kinetics of immune responses in relation to clinical and virological features of a patient with mild-to-moderate coronavirus disease 2019 (COVID-19) that required hospitalization. Increased antibody-secreting cells (ASCs), follicular helper T cells (TFH cells), activated CD4+ T cells and CD8+ T cells and immunoglobulin M (IgM) and IgG antibodies that bound the COVID-19-causing coronavirus SARS-CoV-2 were detected in blood before symptomatic recovery. These immunological changes persisted for at least 7 d following full resolution of symptoms.

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