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Home NEWS Science News Health

Immune boosting benefits of tuberculosis vaccine seen in infants more than a year after vaccination

Bioengineer by Bioengineer
August 5, 2022
in Health
Reading Time: 3 mins read
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The immune boosting benefits of a tuberculosis vaccine can be seen in infants more than one year after vaccination, according to a new study.

Immune boosting benefits of tuberculosis vaccine seen in infants more than a year after vaccination

Credit: Ivan Radic

The immune boosting benefits of a tuberculosis vaccine can be seen in infants more than one year after vaccination, according to a new study.

The research, led by the Murdoch Children’s Research Institute (MCRI) and published in Science Advances, has shown how the BCG vaccine, developed to  prevent the risk of tuberculosis, can produce a ‘trained immunity response’ lasting more than 14 months after the vaccine is administered.

The randomised controlled trial involved 130 infants from the Melbourne Infant Study: BCG for the Prevention of Allergy and Infection (MIS BAIR) and cell dish models to study the immune system’s response to BCG vaccination. Those randomised to be vaccinated received their jab within 10 days of birth.

Murdoch Children’s Dr Samantha Bannister said 14 months after having the BCG vaccination they saw reprogramming, a process where genes were switched off or on, in a specific blood cell type, called the monocyte. 

“The off-target effects of the BCG vaccine against a range of viruses are explained in part by the reprogramming of how your genes work in the monocyte due to environmental and behavioural factors,” she said. The reprogramming of monocytes, a cell previously thought to have no capacity for memory, leads to trained immunity.”

Murdoch Children’s Associate Professor Boris Novakovic said the off-target effects were first identified in Africa, where BCG vaccinated children had reduced overall death rates.

“The off-target effects in Africa were known to last more than a year, but previous studies looking at BCG-associated monocyte signatures only looked at one month and three months following vaccination in adults,” he said. For the first time we have shown how the BCG vaccine can have long-lasting effects on the immune system of infants. 

“As babies are the main population given the BCG vaccine, this study is important because findings in adults do not always translate to children.”

For the trial the research team collaborated with the lab of Professor Mihai Netea from the Radboud University Medical Center in the Netherlands that first described trained immunity and scientists from the International Trained Immunity (INTRIM) Consortium.

Murdoch Children’s and University of Melbourne’s Professor Nigel Curtis said the next step was to see what impact this early trained immunity offered later in childhood and into adulthood.

Professor Curtis’ team at the Murdoch Children’s is leading the BRACE trial, the world’s largest examination of the off-target effects of the BCG vaccine in more than 6800 healthcare workers in Australia, Brazil, Spain, the Netherlands and the United Kingdom. BRACE is testing whether the vaccine can protect those exposed to SARS-CoV-2 from developing severe symptoms by boosting their frontline immunity.

Researchers from the University of Melbourne, The Royal Children’s Hospital, Radboud University Medical Center in The Netherlands, the Walter and Eliza Hall Institute of Medical Research and the University of Bonn in Germany also contributed to the findings.

Publication: Samantha Bannister, Bowon Kim, Jorge Domínguez-Andrés, Gizem Kilic, Brendan R.E. Ansell, Melanie R. Neeland, Simone J.C.F.M. Moorlag, Vasiliki Matzaraki, Amanda Vlahos, Rebecca Shepherd, Susie Germano, Melanie Bahlo, Nicole L. Messina, Richard Saffery, Mihai G. Netea, Nigel Curtis and Boris Novakovic. ‘Neonatal BCG vaccination is associated with a long-term DNA methylation signature in circulating monocytes,’ Science Advances. DOI: 10.1126/sciadv.abn4002

*The content of this communication is the sole responsibility of MCRI and does not reflect the views of the NHMRC.

Available for interview:

Dr Samantha Bannister, Murdoch Children’s researcher

Associate Professor Boris Novakovic, Murdoch Children’s Team Leader, Infection and Immunity



Journal

Science Advances

DOI

10.1126/sciadv.abn4002

Method of Research

Randomized controlled/clinical trial

Subject of Research

People

Article Title

Neonatal BCG vaccination is associated with a long-term DNA methylation signature in circulating monocytes

Article Publication Date

5-Aug-2022

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