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Blood test a potential new tool for controlling infections
12 May 2020
A new technique could provide vital information about a community’s immunity to infectious diseases including malaria and COVID-19.
to understand whether - and when - a person has been
exposed to pathogens including the malaria
parasite. Image from WEHI.TV Malaria Lifecycle animation.
The diagnostic test analyses a blood sample to reveal immune markers that indicate whether – and when – a person was exposed to an infection. It was developed to track malaria infections in communities, to assist in the elimination of deadly ‘relapsing’ malaria, but is now being adapted to track immunity to COVID-19 in more detail than existing tests.
This new diagnostic approach in malaria, published today in Nature Medicine, has the potential to enhance infectious diseases surveillance. This could be of particular benefit in lower income countries where it can enable health authorities to track the spread of a disease such as malaria in a community and target resources where they are most needed. The research was led by researchers from the Walter and Eliza Hall Institute, Australia; Pasteur Institute, France; and Ehime University, Japan.
At a glance
- An international team has developed a new approach to detecting a person’s immunity to an infectious disease – providing valuable details about whether and when a person was exposed to the infection.
- The test was developed for detecting recent exposure to malaria, but the research team are now working to adapt it to detect previous exposure to the coronavirus that causes COVID-19.
- By providing a detailed picture of when an infection spread in a community, the test offers new opportunities for improving infection control and elimination strategies – particularly in lower income countries.
Detecting past infections
to determine whether - and when - a person has been
exposed to infectious diseases.
Exposure to viruses, parasites or bacteria triggers immune responses that lead to antibodies circulating in the blood. These antibodies can remain for years, but over time the amount of different types of antibodies changes.
The new diagnostic technique allows researchers to look in detail at the amounts of different antibodies in the blood, to pinpoint whether – and importantly when – a person has been exposed to a particular infection, said Professor Ivo Mueller, who led the research and has joint appointments at the Walter and Eliza Hall Institute and the Pasteur Institute.
“Many tests for immunity give a simple ‘yes or no’ answer to whether someone has antibodies to the infectious agent,” he said. “In contrast, our test – which was initially developed to look at malaria infections – can pinpoint how long ago a person was exposed to an infection.
“This information is extremely valuable for tracking the spread of an infection in a population. Particularly in lower income countries it may not be possible to monitor the actual spread of the infection, but it is very helpful to look retrospectively at whether the infection has been spreading – and to monitor the effectiveness of infection control programs, and respond to disease resurgence,” he said.
The team established this research to understand the spread of relapsing Plasmodium vivax malaria. The parasite causing this form of malaria – the most widespread malaria parasite in the world – can be carried in a dormant state by people and later reawaken to continue to disease spread, causing significant challenges for malaria control.
Professor Mueller said that his team in Melbourne and France was now applying the systems they have established for malaria to detect immunity to the coronavirus that causes COVID-19.
“We have already started to study the blood of people who have had COVID-19 infections to document the types of antibodies they carry. In the next six months we hope to have discovered how these antibodies change over time, meaning we can use this information to explore immunity in wider groups in the community.
“This is not a tool for diagnosing individual people, but rather for monitoring COVID-19 disease spread in populations. In countries in the Asia-Pacific, Africa or Latin America, it is possible that COVID-19 will be spreading undetected in some regions for the coming year – especially as governments try to loosen shutdown restrictions. This test could be invaluable for informing these decisions.”
Eliminating malaria
a new way to monitor immunity to malaria and other infections
within communities - an important step towards controlling
disease spread.
Walter and Eliza Hall Institute researcher and joint lead author Dr Rhea Longley said the malaria blood test had been validated using samples contributed by people living in malaria-endemic regions of Brazil, Thailand and the Solomon Islands.
“Our investigations confirmed that the test could detect people who had been infected with P. vivax in the preceding nine months – and who would thus be at risk of recurring malaria infections,” Dr Longley said.
“This information will enable better surveillance and deployment of resources to areas where malaria remains, and targeted treatment of infected individuals. This could be a huge improvement in how vivax malaria is controlled and eventually eliminated.”
Further development of the malaria blood test received a recent boost with funding from an Australian Government NHMRC Development Grant, which commenced in 2020.
“We will be working with the Australian biotech company Axxin to develop a diagnostic test for malaria that can be deployed in the field, based on the immune markers our laboratory testing identified,” Professor Mueller said. “We plan to continue clinical trials investigating how our test can guide malaria elimination efforts, and having a rapid field test will be an important aspect of this.”
The research underpinning the new test was led by Professor Mueller and Dr Longley, with Dr Michael White from the Pasteur Institute and Professor Takafumi Tsuboi from Ehime University.
Funding for this research was provided by the Walter and Eliza Hall Institute Innovation Fund, Global Health Innovative Technology Fund, The Foundation for Innovative New Diagnostics, United States National Institute of Allergy and Infectious Diseases, TransEPI consortium (supported by the Bill & Melinda Gates Foundation), National Research Council of Thailand, Japan Society for the Promotion of Science, Howard Hughes Medical Institute, Wellcome Trust (UK), Brazilian National Council for Scientific and Technological Development, United Kingdom Government, Australian National Health and Medical Research Council and Victorian Government.
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Super Content:
Our researchers are working towards better approaches to diagnose, treat and prevent the spread of coronaviruses, both to address the current COVID-19 global outbreak as well as in preparedness for likely future coronaviral disease outbreaks.
This WEHI.TV biomedical animation reconstructs the infection of a human child via mosquito bite, through invasion of cellular tissues including the liver and blood.
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