A partnership between UNMC and the Institut Pasteur de Dakar, Senegal, created in the aftermath of an Ebola outbreak in 2013-16 and funded by the Department of Defense through a task order awarded to the National Strategic Research Institute (NSRI), helped to quickly identify the strain of a new Ebola outbreak in Guinea this year.
Working in collaboration with the Senegalese scientists and Ministry of Health Guinea, Mike Wiley, PhD, and Catherine Pratt of the UNMC College of Public Health, helped identify the strain of the new Guinea outbreak in February as similar to the 2013-16 Ebola outbreak.
The quick identification is the product of years of collaboration.
“When I was at the U.S. Army Research Institute of Infectious Diseases, I was a part of a team that was able to respond to the West African Ebola outbreak in Liberia and deployed sequencing equipment. We were able to partner with the Liberia Institute of Biomedical Research and work with local scientists to produce genomic data,” Dr. Wiley said.
“Using that same model we partnered with the Institut Pasteur de Dakar, and in 2017 deployed sequencing equipment and provided training to the local scientists.”
The collaboration in Senegal and other African countries (Pratt has spent several months in the Democratic Republic of Congo over the last three years) has been ongoing, with annual trips to do refresher training, including helping scientists with genomic sequence during three separate Ebola virus disease outbreaks and a monkey pox outbreak.
“The ultimate goal is to have rapid pathogen characterization so that we know that we have the right therapeutics and assays in place, and this all happens much faster when partnering with local scientists in the affected country compared to having the physical samples come back to the U.S. or Europe,” Dr. Wiley said.
In this most recent case involving samples from the new Guinean Ebola virus outbreak, a shipping delay nearly derailed the process.
“We originally tried to send reagents to our partners in Senegal, through UNMC and our NSRI task order,” Dr. Wiley said. “The package was lost — it was a fluky thing, but you always need a backup plan.”
Using his small business, PraesensBio, operating out of the Nebraska Innovation Campus BioTech Connector based in Lincoln, Nebraska, Dr. Wiley sent a research scientist to hand-carry the required sequencing reagents and a prototype of a target-enrichment assay out to Senegal. The researcher worked with the scientists there to generate genomes from two out of the three samples they had received from the Guinea outbreak.
The results of the genomic sequencing — which, Dr. Wiley said, suggest the source of the new outbreak may be from a persistent infection — have drawn international attention.
But also of note is the success of the collaboration. The speedy identification of the genomic sequencing allows for positive public health impacts.
“Having the genomic data right there off the bat tells you that we already have the diagnostic assays we need, because it’s not different enough from what we’ve seen before,” Dr. Wiley said. “The therapeutics that we have, if they worked on the 2013-16 variant, then they are probably going to work in this outbreak. The same goes for the vaccine. That information provides immediate actionable information to the people on the ground.
“Having the information quickly will help in directing the investigation toward looking for a potential persistently infected source instead of, for example, only looking for connections to an animal reservoir.”
Dr. Wiley described the work as an example of the success of a public-private-academic collaboration.
“All these partnerships that we’ve been developing over the years really worked together to make this happen,” he said.
Partnership pays off during new Ebola outbreak
- Written by John Keenan
- Published Mar 23, 2021
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Working the problem
Following the detection of Ebola in Guinea, three samples were sent to the Institut Pasteur de Dakar.
After the institute generated the genomes, Pratt compared the new sequences to single representative sequences from 16 other Ebola outbreaks.
"We found that it was very similar to the outbreak from 2013-16," she said. "So the next question was, is this a new spillover event from the animal reservoir or is this a continuation from the human outbreak? We compared these new genomes to over 1000 genomes from the previous outbreak and saw that there was 10 shared mutations that occurred during human-to-human transmission," Pratt said. "You can basically now assume that there is no way this is coming as a separate spillover from the animal reservoir."
The team also identified 12 new mutations. With the rate of evolution in Ebola virus at ~20 new mutations expected per a year.
"It's evolving at a lot slower rate than what we see during typical human-to-human transmission," Dr. Wiley said. "We've seen this before when we've investigated cases of Ebola virus disease in previous outbreaks that have arisen through persistent infection. That's why our conclusions from the current data point to this cluster arising from a persistently infected source."
Dr. Wiley and Pratt both cautioned that more work needs to be done to help confirm the genomic data.
"There's other work on the ground being done through your typical epidemiological investigations," he said. "All those different pieces of information can change the story. But the best conclusion that we have with the current genomic data is that the cause of the cluster is through a persistently infected source."
Nice one! Dr. Wiley
Great to hear about your progress!