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Isolation of an environmental contaminant with preferential expansion on C. jejuni cell lawns
We observed a contaminant colony that paradoxically grew preferentially on small, spot-plated lawns of C. jejuni cells on Mueller Hinton (MH) agar (1.5% w/v). The MH plate had previously been inoculated with C. jejuni cells spotted and incubated microaerobically at 38 °C overnight before being stored for several days aerobically at room temperature. Transfer of contaminant cells onto new, similarly prepared spot-plated lawns of C. jejuni resulted in the contaminant again growing preferentially atop the C. jejuni lawns, with minimal growth on the rich agar in between spots of C. jejuni lawns (Fig. 1a). The contaminant was isolated for further study and the strain named ML-A2C4.
Fig. 1: Identification of the filamentous motile environmental isolate as Bacillus mobilis ML-A2C4.

a ML-A2C4 filamentous growth on C. jejuni lawn spots (small circles). b ML-A2C4 growth on a control 1.5% agar MH plate (left) and on a MH plate spread with a full confluent C. jejuni lawn (center) after 48 h aerobic incubation at 30 °C. The red box shows a close-up view of the filaments at the growth edge (right). c Quantification of the visible growth diameter on control MH plates (black bars) and plates with C. jejuni lawns (red bars) over time (n = 5) with error bars indicating standard deviation (SD). Statistical analysis was performed for growth diameter on C. jejuni lawn plates versus control plates using the Student’s t test with Welch’s correction, and for 48 vs. 24 h using repeated measures one-way ANOVA, with ****p  More

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NEWS
07 August 2020

Researchers are redoubling efforts to understand links between species loss and emerging diseases — and use that information to predict and stop future outbreaks.

Jeff Tollefson

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Controlling deforestation (shown here, in a tropical rainforest in the Congo Basin) could decrease the risk of future pandemics, experts say.Credit: Patrick Landmann/Science Photo Library

As humans diminish biodiversity by cutting down forests and building more infrastructure, they’re increasing the risk of disease pandemics such as COVID-19. Many ecologists have long suspected this, but a new study helps to reveal why: while some species are going extinct, those that tend to survive and thrive — rats and bats, for instance — are more likely to host potentially dangerous pathogens that can make the jump to humans.
The analysis of around 6,800 ecological communities on 6 continents adds to a growing body of evidence that connects trends in human development and biodiversity loss to disease outbreaks — but stops short of projecting where new disease outbreaks might occur.
“We’ve been warning about this for decades,” says Kate Jones, an ecological modeller at University College London and an author on the study, published on 5 August in Nature1. “Nobody paid any attention.”
Jones is one of a cadre of researchers that has long been delving into relationships among biodiversity, land use and emerging infectious diseases. Their work has mostly flown below the radar, but now, as the world reels from the COVID-19 pandemic, efforts to map risks in communities across the globe and to project where diseases are most likely to emerge are taking centre stage.

Last week, the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services (IPBES) hosted an online workshop on the nexus between biodiversity loss and emerging diseases. The organization’s goal now is to produce an expert assessment of the science underlying that connection ahead of a United Nations summit in New York that’s planned for September, where governments are expected to make new commitments to preserve biodiversity.
Others are calling for a more wide-ranging course of action. On 24 July, an interdisciplinary group of scientists, including virologists, economists and ecologists, published an essay in Science2, arguing that governments can help reduce the risk of future pandemics by controlling deforestation and curbing the wildlife trade, which involves the sale and consumption of wild — and often rare — animals that can host dangerous pathogens.
Most efforts to prevent the spread of new diseases tend to focus on vaccine development, early diagnosis and containment, but that’s like treating the symptoms without addressing the underlying cause, says Peter Daszak, a zoologist at the non-governmental organization EcoHealth Alliance in New York, who chaired the IPBES workshop. He says COVID-19 has helped to clarify the need to investigate biodiversity’s role in pathogen transmission.
The latest work by Jones’s team bolsters the case for action, Daszak says. “We’re looking for ways to shift behaviour that would directly benefit biodiversity and reduce health risks.”
Concentrating risk
Previous research has shown that outbreaks of diseases such as severe acute respiratory syndrome (SARS) and bird influenza that cross over from animals to humans have increased in the past few decades3,4. This phenomenon is likely to be the direct result of increased contact between humans, wildlife and livestock, as people move into undeveloped areas. These interactions happen more frequently on the frontier of human expansion because of changes to the natural landscape and increased encounters with animals. A study published in April by researchers at Stanford University in California found that deforestation and habitat fragmentation in Uganda increased direct encounters between primates and people, as primates ventured out of the forest to raid crops and people ventured in to collect wood5.
But a key question over the past decade has been whether the decline in biodiversity that inevitably accompanies human expansion on the rural frontier increases the pool of pathogens that can make the jump from animals to humans. Work by Jones and others6 suggests that the answer in many cases is yes, because a loss in biodiversity usually results in a few species replacing many — and these species tend to be the ones hosting pathogens that can spread to humans.
For their latest analysis, Jones and her team compiled more than 3.2 million records from several hundred ecological studies at sites around the world, ranging from native forests to cropland to cities. They found that the populations of species known to host diseases transmissible to humans — including 143 mammals such as bats, rodents and various primates — increased as the landscape changed from natural to urban, and as biodiversity generally decreased.

The next step for Jones’s team is to examine the likelihood of disease transmission to the human population. The group has already made this type of evaluation for Ebola virus outbreaks in Africa, creating risk maps based on development trends, the presence of probable host species, and socio-economic factors that determine the pace at which a virus might spread once it enters the human population7. The group’s risk maps accurately captured where outbreaks occurred in the Democratic Republic of the Congo (DRC) in the past few years, suggesting that it is possible to understand and project risks on the basis of relationships between factors such as land use, ecology, climate and biodiversity.
Some researchers urge caution when communicating that biodiversity hotspots are where outbreaks are likely to occur. “My worry, frankly, is that people are going to cut down the forests more if this is where they think the next pandemic is going to come from,” says Dan Nepstad, a tropical ecologist and founder of the Earth Innovation Institute based in San Francisco, California, a non-profit organization that campaigns for sustainable development. Efforts to preserve biodiversity will only work, he says, if they address the economic and cultural factors that drive deforestation and the rural poor’s dependency on hunting and trading wild animals.
Ibrahima Socé Fall, an epidemiologist and head of the World Health Organization’s emergency operations in Africa, agrees that understanding the ecology — as well as the social and economic trends — of the rural frontier will be crucial to projecting the risk of future disease outbreaks. “Sustainable development is crucial,” he says. “If we continue to have this level of deforestation, disorganized mining and unplanned development, we are going to have more outbreaks.”
Coordinating efforts
One message that the IPBES’s upcoming report is likely to deliver is that scientists and policymakers need to treat the rural frontier more holistically, addressing issues of public health, the environment and sustainable development in tandem. In the wake of the COVID-19 pandemic, many scientists and conservationists have emphasized curbing the wildlife trade — an industry worth an estimated US$20 billion annually in China, where the first coronavirus infections appeared. China has temporarily suspended its trade. But Daszak says the industry is just one piece in a larger puzzle that involves hunting, livestock, land use and ecology.

Wildlife markets like this one in Bali, Indonesia, sustain the livelihoods of many people. But they are also under scrutiny as hotspots for pathogen transmission.Credit: Amilia Roso/The Sydney Morning Herald via Getty

“Ecologists should be working with infectious-disease researchers, public-health workers and medics to track environmental change, assess the risk of pathogens crossing over and reduce risky human activities,” he says.
Daszak was an author of last month’s essay in Science, which argued that governments could substantially reduce the risk of future pandemics such as COVID-19 by investing in efforts to curb deforestation and the wildlife trade, as well as in efforts to monitor, prevent and control new virus outbreaks from wildlife and livestock. The team estimated that the cost of these actions would ring in at $22 billion to $33 billion annually, including $19.4 billion for ending trade in wild meat in China — a step that not all experts think is desirable or necessary — and up to $9.6 billion to help curb tropical deforestation. The total investment would be two orders of magnitude less than the $5.6-trillion price tag estimated for the COVID-19 pandemic, the team estimates.

Fall says the key is to align efforts by government and international agencies focused on public health, animal health, the environment and sustainable development. The latest Ebola outbreak in the DRC, which began in 2018 and ended last month, had its roots not just in disease but also in deforestation, mining, political instability and the movement of people. The goal must be to focus resources on the riskiest areas and manage interactions between people and animals, both wild and domestic, Fall says.
With the right collaboration between human health, animal health and environmental authorities, Fall says, “you have some mechanisms for early warnings”.

doi: 10.1038/d41586-020-02341-1

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