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Meet the Microbiologist

Ashley Hagen, M.S.
Meet the Microbiologist
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  • Early Microbial Life with Michael Lynch and Vaughn Cooper
    Michael Lynch, Ph.D., Director of the Center for Mechanisms of Evolution at Arizona State University and Vaughn Cooper, Ph.D., professor of Microbiology and Molecular Genetics at the University of Pittsburgh, School of Medicine, examine the origins and trajectory of early microbial life (EML) and discuss the collaborative report between the American Academy of Microbiology and the Gordon and Betty Moore Foundation, which explores the journey of life on Earth, from non-living chemical compounds to early unicellular life, to the vast diversity of organisms we see today. This episode is brought to you by the American Academy of Microbiology, a think tank at American Society for Microbiology and the Gordon and Betty Moore Foundation, which has been dedicated to advancing scientific discovery for the past 25 years. Links for This Episode: Project Report Early Microbial Life: Our Past, Present and Future. Article: The Great Oxidation Event: How Cyanobacteria Changed Life. MTM Podcast: From Hydrothermal Vents to Cold Seeps: How Bacteria Sustain Ocean Life With Nicole Dubilier. Take the MTM listener survey! 
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  • How FMTs, Coprophagia and the Milk Microbiome Inform Wildlife Conservation With Sally Bornbusch
    Sally Bornbusch, Ph.D., is an NSF postdoctoral fellow in biology conducting microbial ecology research in animal care and conservation at the Smithsonian National Zoo & Conservation Biology Institute. She discusses how FMTs are being used to mitigate health concerns in wild animals in captivity, shares key findings about the milk microbiome from the Smithsonian milk repository, the largest collection of exotic animal milks in the world, and explains the science behind eating poo (Coprophagia).  Links for This Episode Why Do Animals Eat Poop? (And Why It Might Be a Good Thing). Faeces as food: a framework for adaptive nutritional coprophagy in vertebrates. Even Monkeys Should Eat Their Vegetables. Take the MTM listener survey! 
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  • Agnostic Diagnostics and the Future of ASM Health With Dev Mittar
    Dev Mittar, Ph.D., Scientific Director of the ASM Health Scientific Unit discusses the use of metagenomic next generation sequencing to develop agnostic diagnostic technology, giving scientists and clinicians alike, a tool to diagnose any infectious disease with one single test. He also discusses how the ASM Health Unit is empowering scientists and leveraging microbial science innovations to address critical global health challenges and improve lives worldwide. Ashley's Biggest Takeaways The Division of Research, Innovation and Ventures is a small entrepreneurial arm of BARDA that takes on early-stage projects with high potential of turning into medical countermeasures. Prior to his role as Scientific Director for ASM Health, Mittar worked as a health scientist and program officer at DRIVe, where he focused on advancing high-impact science. He is particularly passionate about his work to develop agnostic diagnostics—a single test that uses metagenomic next generation sequencing to identify any pathogen from 1 clinical sample. Mittar discusses applications for this technology in surveillance (pandemic preparedness), variant detection, AMR and clinical settings (diagnosing complicated infections where etiology is not clearly defined). He also shares how a recent bout with illness emphasized the value and potential of this technology to save money, time, pain and suffering of the patient. Agnostic diagnostics can also help prevent the overuse/misuse of antibiotics, which are key factors in the spread of antimicrobial resistance. Furthermore, when this technology is coupled with the use of metatranscriptomics, it can provide information about the patient’s immune profile that can be helpful in developing personalized treatment strategies, as opposed to a one-size-fits-all approach. ASM is organizing around 3 scientific units, ASM Health, ASM Mechanism Discovery and ASM Applied and Environmental Microbiology. These units will empower researchers and scientists to use science make a difference in the world and provide a forum for them to come together to shape the future of the field. Links for This Episode Learn More About ASM’s Scientific Units. Join the Conversation on ASM Connect, our online community platform. Browse Volunteer Opportunities. Become an ASM Member. Register for ASM Microbe 2025.
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  • Implementing a National Action Plan to Combat AMR in Pakistan With Afreenish Amir
    Episode Summary Afreenish Amir, Ph.D., Antimicrobial Resistance (AMR) Project Director at the National Institute of Health in Pakistan, highlights significant increases in extensively drug-resistant typhoid and cholera cases in Pakistan and discusses local factors driving AMR in Asia. She describes the development and implementation of a National Action Plan to combat AMR in a developing country, emphasizing the importance of rational antimicrobial use, surveillance and infection control practice. Ashley's Biggest Takeaways AMR is a global and One Health issue. Pakistan has a huge disease burden of AMR. Contributing factors include, but are not limited to, overcrowding, lack of infection control practices, poor waste management practices and over-the-counter prescription practices. Promoting the rational use of antimicrobials is imperative at all levels—from tertiary care to primary care practitioners. Typhoid and cholera are high-burden infections in Pakistan, with typhoid being a year-round issue and cholera being seasonal. A holistic approach, involving various sectors and disciplines, is necessary in order to address the global AMR threat. Amir highlights the need for better communication and collaboration to bridge gaps and build trust between different organizations. Featured Quotes: I've been working at the National Institutes of Health for the last 7 years now. So, I've been engaged in the development and the implementation of the national action plan on AMR, and that gave me the opportunity to explore the work in the field of antimicrobial resistance. Reality of AMR in Pakistan [Pakistan] is an LMIC, and we have a huge disease burden of antimicrobial resistance in the country right now. A few years back, there was a situational analysis conducted, and that has shown that there is presence of a large number of resistant pathogens within the country. And National Institutes of Health, they have started a very standardized surveillance program based upon the global antimicrobial use and surveillance system back in 2017. And [those datasets have] generated good evidence about the basic statistics of AMR within the country. So, for example, if I talk about the extensively drug-resistant typhoid, typhoid is very much prevalent in the country. Our data shows that in 2017 there were 18% MDR typhoid cases through the surveillance data. And in 2021 it was like 60%. So that has shown that how the resistance has increased a lot. A number of challenges are associated with this kind of a thing, overcrowded hospitals, poor infection prevention and control (IPC) measures. So, there is AMR within the country—there's a huge burden—and we are trying to look for the better solutions.  Local Factors Driving AMR Bacteria, they do not know the borders. We have a close connection with the other Asian countries, and we have a long border connected with the 2 big countries, which are Afghanistan and India and Bangladesh and China. So, we see that it's not limited to 1 area. It's not regional. It’s also a history of travel. When the people travel from one area to the other, they carry the pathogen as a colonizer or as a carrier, and they can infect [other] people. So, it's really connected, and it's really alarming as well. You never know how the disease is transmitted, and we have the biggest example of COVID—how things have spread from 1 country to the other, and how it has resulted in a massive pandemic. AMR is similar. We have seen that it's not limited to 1 region. We are part of this global community, and we are contributing somehow to the problem. First, I'll talk about the health care infrastructure. We do have the capacities in the hospitals, but still, there's a huge population. Pakistan is a thickly populated country. It's a population of around 241 million. And with the increasing population, we see that the infrastructure has not developed this much. So now the existing hospitals are overcrowded, and this has led to poor infection control practices within the hospitals. The staff is not there. In fact, ID consultants are not available in all the hospitals. Infection control nurses are not available in all the hospitals. So, this is one of the main areas that we see, that there is a big challenge. The other thing that can contribute is the poor waste management practices. Some of the hospitals—private and public sectors—they are following the waste management guidelines—even the laboratories. But many of the hospitals are not following the guidelines. And you know that AMR is under one health. So, whatever waste comes from the hospital eventually goes to the environment, and then from there to the animal sector and to the human sector. [Another big] problem that we are seeing is the over-the-counter prescription of antimicrobials. There is no regulation available in the country right now to control the over-the-counter prescription of antibiotics. They are easily available. People are taking the antibiotics without a prescription from the doctors, and the pharmacist is giving the patients any kind of medicine. And either it is effective/not effective, it's a falsified, low-quality antibiotic for how long in duration antibiotic should be taken. So, there are multiple of things or reasons that we see behind this issue of AMR. Rational Use of Antimicrobials It is a complex process how we manage this thing, but what we are closely looking at in the country right now is that we promote the rational use of antimicrobials at all levels—not only at the tertiary care levels, but also at the general practitioner level. They are the first point of contact for the patients, with the doctors, with the clinicians. So, at this point, I think the empirical treatment needs to be defined, and they need to understand the importance of this, their local antibiograms, what are the local trends? What are the patterns? And they need to prescribe according to those patterns. And very recently, the AWaRE classification of WHO, that is a big, big support in identifying the rational use of antimicrobials—Access, Watch and Reserve list—that should be propagated and that should be understood by all the general practitioners. And again, I must say that it's all connected with the regulations. There should be close monitoring of all the antibiotic prescriptions, and that can help to control the issue of AMR. National Action Plan on AMR So, when I joined NIH, the National Election plan had already been developed. It was back in 2017, and we have a good senior hierarchy who has been working on it very closely for a long period of time. So, the Global Action Plan on AMR, that has been our guiding document for the development of the national action plan on AMR, and we are following the 5 strategic objectives proposed in the global action plan. The five areas included: The promotion of advocacy and awareness in the community and health care professionals. To generate evidence through the data, through the surveillance systems. Generation of support toward infection prevention and control services IPC. Promoting the use of antimicrobials both in the human sector and the animal sector, but under the concept of stewardship, antimicrobial consumption and utilization. Invest in the research and vaccine and development. So, these are some of the guiding principles for us to develop the National Action Plan, and it has already been developed. And it's a very comprehensive approach, I must say. And our institute has started working on it, basically towards recreating awareness and advocacy. And we have been successful in creating advocacy and awareness at a mass level. Surveillance We have a network of Sentinel surveillance laboratories engaged with us, and they are sharing the data with NIH on a regular basis, and this is helping NIH to understand the basic trends on AMR and what is happening. And eventually we plan to go towards this case-based surveillance as well, but this is definitely going to take some time because to make people understand the importance of surveillance, this is the first thing. And very recently, the Institute and country has started working towards the hospital acquired infection surveillance as well. So, this is a much-needed approach, because the lab and the hospital go hand in hand, like whatever is happening in the lab, they eventually reach the patients who are in the hospitals. Wastewater surveillance is the key. You are very right. Our institute has done some of the work toward typhoid and cholera wastewater surveillance, and we were trying to identify the sources where we are getting these kinds of pathogens. These are all enteric pathogens. They are the key source for the infection. And for the wastewater surveillance mechanism, we can say that we have to engage multiple stakeholders in this development process. It's not only the laboratory people at NIH, but we need to have a good epidemiologist. We need to have all the water agencies, like the public health engineering departments, the PCRWR, the environmental protection agencies who are working with all these wastewater sites. So, we need to connect with them to make a good platform and to make this program in a more robust fashion. Pathogens and Disease Burdon For cholera and typhoid within Pakistan, I must say these are the high burden infections or diseases that we are seeing. For typhoid, the burden is quite high. We have seen a transition from the multidrug-resistant pathogens to the extensively drug-resistant pathogens, which now we are left with only azithromycin and the carbapenems. So, the burden is high. And when we talk about cholera, it is present in the country, but many of the times it is seasonal. It comes in during the time of the small zone rains and during the time of floods. So, every year, during this time, there are certain outbreaks that we have seen in different areas of the country. So, both diseases are there, but typhoid is like all year long—we see number of cases coming up—and for cholera, it's mainly seasonal. Capacity Building and ASM's Global Public Health Programs Capacity building is a key to everything, I must say, [whether] you talk about the training or development of materials. I've been engaged with ASM for quite some time. I worked to develop a [One Health] poster in the local language to create awareness about zoonotic diseases. So, we have targeted the 6 zoonotic diseases, including the anthrax, including the Crimean-Congo hemorrhagic fever and influenza. And we have generated a very user-friendly kind of layout in the local language, trying to teach people about the source of transmission. What are the routes of transmission, if we talk about the CCHF? And then how this can be prevented. So, this was one approach. And then I was engaged with the development of the Learnamr.com. This is online platform with 15 different e-modules within it, and we have covered different aspects—talking about the basic bacteriology toward the advanced, standardized methods, and we have talked about the national and global strategies [to combat] AMR, One Health aspects of AMR, vaccines. So, it's a huge platform, and I'm really thankful to ASM for supporting the program for development. And it's an online module. I have seen that there are around more than 500 subscribers to this program right now, and people are learning, and they are giving good feedback to the program as well. We keep on improving ourselves, but the good thing is that people are learning, and they are able to understand the basic concepts on AMR. Links for This Episode: Experts Discuss One Health in Pakistan: Biosafety Education Inside and Outside the Lab.  Explore ASM’s Global Public Health Programs.  Download poster about zoonotic disease in English or Urdu.  Progress on the national action plan of Pakistan on antimicrobial resistance (AMR): A narrative review and the implications.  Global diversity and antimicrobial resistance of typhoid fever pathogens: insights from 13,000 Salmonella Typhi genomes.  Wastewater based environmental surveillance of toxigenic Vibrio cholerae in Pakistan.  Point Prevalence Survey of Antimicrobial Use in Selected Tertiary Care Hospitals of Pakistan Using WHO Methodology: Results and Inferences.  Overcoming the challenges of antimicrobial resistance in developing countries.  Take the MTM listener survey! 
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  • Discovering Fossilized Microbes in Antarctic Ice Cores With Manuel Martinez Garcia
    Manuel Martinez Garcia, Ph.D., a professor of microbiology in the Physiology, Genetics and Microbiology Department at the University of Alicante in Spain, paints a picture of what microbial life looked like thousands of years ago by analyzing microbial genomic signatures within ice cores collected from the Antarctic ice shelves in the 1990s.  Links for the Episode  New avenues for potentially seeking microbial responses to climate change beneath Antarctic ice shelves – mSphere paper.  Viruses under the Antarctic Ice Shelf are active and potentially involved in global nutrient cycles – Nature communications article.  Manuel Martinez Garcia’s Lab website.  How stable is the West Antarctic Ice Shelf? – Press Release from Alfred Wegener Institute. Take the MTM listener survey! Watch this episode: https://youtu.be/CHCMO74_gIY Ashley’s Biggest Takeaways There is a unique habitat beneath Antarctic ice shelves, where microbes live without light and rely on unusual energy sources.  Ice cores from these Antarctic ice shelves can preserve fossilized genomic records of microbial life from long ago.  Comparing past and present samples can help us understand how microbial life is responding to environmental stressors, like temperature changes and acidification, over time. It can also provide key insights to changes in biodiversity. Featured Quotes:  Motivation for the Research Ice shelves are like massive floating ice that are in Antarctica, mainly. They can be as big as, for example, France, the country. So, they are super big—they are enormous. And they can be as thick as, let's say, 1000 meters. So, this is a massive [piece of] ice that we have in our planet.   And beneath that massive ice, we can have a very peculiar and a special habitat in which microbes live without light. They have to manage, to thrive and reproduce, without using a standard energy like we have on the surface of the sea or in the forest, where we have light that is driving and providing the energy for the ecosystem. But in this case, these ecosystems are totally different.  [The ice shelves] are deep and interconnected. Basically, there are different oceanic currents, for example, there is one Circumpolar Current that surrounds Antarctica, and there are also other currents that basically go from the bottom to the surface, moving, you know, all the water masses.  The interesting part of this story is that every single second in our lives, this sea that is beneath the platform, the ice shelf, is frozen over and over, and then we have different layers of antiquity that preserve the microbes that are living in the ocean. So, for example, let's say, 1000 years ago, the sea water was frozen, and then we can find a layer beneath the Antarctica ice shelf, where these microbes are preserved and frozen. Basically, it's like a record—a library of microbes, fossil records of microbes—from the past ocean, from 1000 years ago until present, more or less.  And then we can go to these records, to these layers of frozen sea water, and pick these samples to somehow recover the genetic material of the microbes that were preserved and frozen 1000 years ago or 500 years ago, in the way that we can somehow reconstruct or build the genetic story of the microbes from the past, for example, pre-industrial revolution to present.  We need to think that microbes sustain the rest of the food web. So, they sustain of the rest of life in the ocean. They provide carbon for the rest of organisms, the fishes, whales [and other] big animals that we have in our oceans. And if the microbes are responding in a way that is not satisfactory, or in the way that we think can maintain the food web, this is kind of scary. And this is what we are trying to do: we are trying to go back to the past and see how the microbes are changing [genetically].  Sample Collection We didn't collect the samples. [They were collected] back in the 90s, so, 40 years ago, by a German group led by the Alfred Wegener Institute, which is probably one of the most famous polar institutes in the world. They, basically, led an expedition, I think it was in 92, and they decided to go to this ice shelf in Antarctica, in the Filchner–Ronne Ice Shelf to collect these ice cores.   And then the surprise was when they were progressing in the drilling, they realized that on the top part of the ice core was fresh water, meteoric snow that was compacted forming the ice. But they realized that below that part, there was a sea water that was frozen. And then they thought that these samples were very interesting, because they somehow store material from the past, and they shipped these samples to Alfred Werner Institute in Bremerhaven in Germany.   And half of the samples were stored for 40 years until I decided to contact the Institute and to propose this research. And I basically contacted the director of the Institute, and also the group of Frank Wilhelm, to propose the idea. And basically, I said, ‘Hey, I think what you have in your research is a valuable material that that can provide interesting answers for climate change and microbiology.’ And they say, ‘Well, that's interesting. And we never thought about that.’ And then we started a collaboration to dig into these questions.  Shipping the Ice Cores We had a meeting after one of the first pandemic lockdowns, when they allow [me] to travel. I went to Bremerhaven to have a personal meeting with the team. And we decided to ship some samples to Spain.   They arrived frozen and very well packaged and preserved in an isolated container. But it was really surprising to see that that they were delivered in the same compartment with a dry ham. That was a that was a funny story!  Sample Preparation When we received the samples, the first thing was to basically decontaminate the surface of the [ice]. Because when you unpackage, you have an ice core, pieces like a half meter. And then, we have to think that this ice core has been manipulated by different groups, different people. And you have to decontaminate the surface of the ice core in order to just have the center of the ice core for the for the investigation.  And basically, we adapted a protocol in order to make sure that we didn’t have cross contamination from the rest of the from the surface.  So, what we did was we melted the center of the core—well, in fact, different parts of the core with different ages, from 1000 years old to 200 years old—and we melted in a very dedicated laminar flow hood that we have in a clean room. And then, we extracted the DNA from that piece. And in our case, the amount of DNA was so little that we had to amplify with some molecular techniques in order to have [enough] copies of this genetic material to do sequencing.  Sample Analysis I will say that we are in the middle of the project. We had, like, 2 years ongoing for the project.  The most surprising was 2 things. One, in the sea water, beneath the Antarctic, we discovered a very autoctonos (indigenous) viral community that was quite different from the rest of the world, I will say, from the rest of the ocean. So, I think this viral community is quite adapted to infect the microbes that are living in this peculiar environment beneath the Antarctica ice shelf.  And these viruses were carrying some genes that we think are very important for microbes. We call these genes auxiliary metabolic genes. And these genes are very important because somehow the viruses provide these pieces of information, of DNA material, to microbes that are driving important ecological roles, like, for example, carbon fixation.  It's very important, because carbon fixation is probably the primary step in all ecosystems—to provide food for the rest of the organisms. And if this is altering, or we are altering it with different factors—like temperature increase, like melting of the ice—its going to change these patterns and the rate of carbon fixation. This is going to produce a deep impact for the rest of organisms.  We are still investigating, but we think that it's interesting to think that microbes that live in our ocean now are responding to stressing factors like increasing temperature and also acidification by different ways. In fact, it is unclear—it is a very hot topic and a very hot question—because we don't know for sure what the fate of these microbes in our oceans is going to be. For example, people think that we are going to lose biodiversity. There are some hypotheses that say that heterotrophy is going to be more predominant in the sea water. But it's unclear, because we don't really have fossil records that can compare the past to the present, and this is what we can provide, or at least potentially provide. We can say, ‘Hey, we can go before the industrial revolution, before the CO2 increase, and try to compare series of different samples until the present in order to see if, for example, heterotrophy, or microbes that are heterotrophs, are more predominant in modern samples compared to unseen samples.   
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Om Meet the Microbiologist

Who is microbiology? Meet the Microbiologist (MTM) introduces you to the people who discover, innovate and advance the field of microbiology. Go behind-the-scenes of the microbial sciences with experts in virology, bacteriology, mycology, parasitology and more! Share in their passion for microbes and hear about research successes and even a few setbacks in their field. MTM covers everything from genomics, antibiotic resistance, synthetic biology, emerging infectious diseases, microbial ecology, public health, social equity, host-microbe biology, drug discovery, artificial intelligence, the microbiome and more! From graduate students to working clinicians and emeritus professors, host, Ashley Hagen, Scientific and Digital Editor at the American Society for Microbiology, highlights professionals in all stages of their careers, gleaning wisdom, career advice and even a bit of mentorship along the way.
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