Dr. Tschetter investigates how specific strains of bacteria that cause foodborne illnesses affect public health. His work includes studying outbreaks linked to contaminated food sources like turkey, beef, and leafy greens. He utilizes advanced genetic testing techniques to identify and trace these bacteria, which helps in managing outbreaks and informing food safety practices. His research also explores the impacts of specific food production processes, like mechanically tenderizing beef or using raw milk in cheese.
Key findings
Identified two main genetic variations of Salmonella that are linked to antibiotic resistance, improving tracking and management of foodborne illnesses.
Discovered new Salmonella serotype Reading linked to human illnesses from turkey production, with nearly 1,000 samples analyzed.
Led to the largest beef recall in Canadian history, affecting 4,000 tons of contaminated beef after an outbreak of E. coli O157:H7 infected 18 people.
Found that whole-genome sequencing improved outbreak detection accuracy for E. coli O157:H7, differentiating between outbreak and non-outbreak cases with very few genetic differences.
Revealed that an outbreak of E. coli linked to aged raw milk Gouda cheese affected 29 people, with one fatality, prompting a review of cheese production practices.
Frequently asked questions
Does Dr. Tschetter study Salmonella infections?
Yes, Dr. Tschetter focuses on various strains of Salmonella, including those linked to foodborne illnesses.
What treatments or interventions has Dr. Tschetter researched?
His research includes tracking outbreaks to inform food safety practices and prevent future infections.
Is Dr. Tschetter's work relevant to patients who consume packaged salads?
Yes, his studies on listeriosis outbreaks from packaged salads help improve safety practices for consumers.
How does Dr. Tschetter's research impact food production?
His findings promote safer food handling and processing practices in the food industry to protect public health.
What methods does Dr. Tschetter use to track bacterial outbreaks?
He employs advanced genetic testing methods like whole-genome sequencing to accurately identify and source bacteria involved in outbreaks.
Publications in plain English
Population structure, case clusters, and genetic lesions associated with Canadian Salmonella 4,[5],12:i:- isolates.
2021
PloS one
Clark CG, Kearney AK, Tschetter L, Robertson J, Pollari F +6 more
Plain English This study looked at a type of bacteria called Salmonella 4,[5]:12:i:-, which is a significant public health concern because it can make people sick and is often resistant to antibiotics. Researchers analyzed 811 samples and found that two main genetic variations linked to antibiotic resistance spread mostly in specific groups of bacteria associated with non-human sources like water and shellfish. Understanding these variations helps improve tracking and managing foodborne illness outbreaks.
Who this helps: This benefits public health officials, doctors, and patients at risk of Salmonella infections.
Emergence of a Novel Salmonella enterica Serotype Reading Clonal Group Is Linked to Its Expansion in Commercial Turkey Production, Resulting in Unanticipated Human Illness in North America.
2020
mSphere
Miller EA, Elnekave E, Flores-Figueroa C, Johnson A, Kearney A +9 more
Plain English This study investigated a new strain of the Salmonella bacteria, called serotype Reading, which was linked to two outbreaks of human illnesses in North America between 2017 and 2019. Researchers analyzed nearly 1,000 samples and found that this new strain emerged alongside increased turkey production, suggesting that it became more widespread due to some genetic changes that allowed it to survive better and resist treatments. Understanding how this strain spreads from turkeys to people is crucial for preventing future foodborne illnesses.
Who this helps: This benefits public health officials, consumers, and the food industry.
Shared genome analyses of notable listeriosis outbreaks, highlighting the critical importance of epidemiological evidence, input datasets and interpretation criteria.
2019
Microbial genomics
Reimer A, Weedmark K, Petkau A, Peterson CL, Walker M +17 more
Plain English This study looked at 52 samples of Listeria bacteria collected over several decades to better understand how they are related genetically, especially during recognized outbreaks. Researchers found that, while most genetic relationships were consistent with known outbreak information, a specific strain (CC8) showed complex patterns that made it harder to track the source of infections. This discovery highlights the need for using both genetic data and traditional outbreak information to effectively manage public health and food safety.
Who this helps: This helps public health officials and food safety experts track and prevent listeriosis outbreaks.
Multistate Outbreak of Listeriosis Associated with Packaged Leafy Green Salads, United States and Canada, 2015-2016.
2019
Emerging infectious diseases
Self JL, Conrad A, Stroika S, Jackson A, Whitlock L +13 more
Plain English This study looked into a listeriosis outbreak linked to packaged leafy green salads in the U.S. and Canada between 2015 and 2016, finding 19 cases in the U.S. and 14 in Canada. All patients in the U.S. surveyed had eaten salad, and those who remembered the brand pointed to products from the same processing facility, which also matched the bacteria found in the patients. The findings led to a recall of the salads, highlighting the need for better safety practices to prevent future contamination.
Who this helps: This helps patients who consume packaged salads and the food industry by encouraging safer food handling practices.
Outbreak ofO157:H7 Infections Linked to Mechanically Tenderized Beef and the Largest Beef Recall in Canada, 2012.
2019
Journal of food protection
Currie A, Honish L, Cutler J, Locas A, Lavoie MC +21 more
Plain English In 2012, a beef plant in Alberta, Canada, was linked to an outbreak of E. coli O157:H7 infections after contaminated needle-tenderized steaks were purchased by consumers. A total of 18 people fell ill due to this specific strain of the bacteria, prompting the largest beef recall in Canadian history, with 4,000 tons of beef products removed from the market. This outbreak highlighted the need for better safety measures in beef processing, leading to new regulations that require labeling for mechanically tenderized beef and safe cooking instructions to prevent future infections.
Who this helps: This helps consumers and public health officials by ensuring safer meat products.
Outbreak of Escherichia coli O157:H7 Infections Linked to Aged Raw Milk Gouda Cheese, Canada, 2013.
2018
Journal of food protection
Currie A, Galanis E, Chacon PA, Murray R, Wilcott L +18 more
Plain English This study examined an outbreak of E. coli O157:H7 infections linked to aged raw milk Gouda cheese in Canada from July to September 2013, affecting 29 people across five provinces. Of those affected, five were hospitalized, and one person died; 90% reported eating Gouda cheese from a specific dairy plant in British Columbia that was made with raw milk. The findings revealed that the E. coli strain survived even after the cheese was aged for 60 days, indicating that this aging process does not guarantee safety from harmful bacteria, prompting a review of cheese production practices.
Who this helps: This helps patients, particularly those consuming raw milk cheese.
Outbreak of Salmonella Typhimurium associated with feeder rodents.
2018
Zoonoses and public health
Vrbova L, Sivanantharajah S, Walton R, Whitfield Y, Lee C +5 more
Plain English Researchers studied an outbreak of Salmonella Typhimurium in Ontario, Canada, affecting 134 people over three years, with nearly half of the cases in children under 12. They traced the outbreak to feeder rodents used to feed snakes, which made people sick through direct or indirect contact with these animals. This study highlights the health risks feeder rodents pose, especially to vulnerable groups like young children.
Who this helps: This helps parents, pet owners, and healthcare providers.
Evaluation of whole-genome sequencing for outbreak detection of Verotoxigenic Escherichia coli O157:H7 from the Canadian perspective.
2018
BMC genomics
Rumore J, Tschetter L, Kearney A, Kandar R, McCormick R +4 more
Plain English This study evaluated a new method called whole-genome sequencing (WGS) for identifying Verotoxigenic Escherichia coli (VTEC) O157:H7 outbreaks in Canada. Researchers found that WGS could clearly differentiate between bacteria from outbreak cases and non-outbreak cases, with very few genetic differences (5 or fewer changes) in related samples, suggesting it is more effective than older methods. This is important because it helps public health officials track and prevent foodborne illnesses more accurately and rapidly.
Who this helps: This benefits public health officials and food safety regulators.
Outbreak ofReading in persons of Eastern Mediterranean origin in Canada, 2014-2015.
2017
Canada communicable disease report = Releve des maladies transmissibles au Canada
Tanguay F, Vrbova L, Anderson M, Whitfield Y, Macdonald L +3 more
Plain English This study looked at an outbreak of a rare illness called Reading that affected over 30 people in Canada between late 2014 and 2015, mostly among those of Eastern Mediterranean descent, including Afghans and Lebanese. Investigators found high rates of illness in places like Ontario and Alberta, with 31 confirmed cases and 7 hospitalizations, but no deaths. Although some food samples from ethnic bakeries tested positive for the bacteria, the exact source of the outbreak couldn't be pinpointed, highlighting the need for better understanding of the diverse foods consumed by different communities in Canada.
Who this helps: This benefits public health officials and local communities, especially those with diverse cultural backgrounds.
Brookings supports breastfeeding: using public deliberation as a community-engaged approach to dissemination of research.
2017
Translational behavioral medicine
Anderson J, Kuehl RA, Mehltretter Drury SA, Tschetter L, Schwaegerl M +5 more
Plain English This study focused on increasing awareness and support for breastfeeding in a community. Researchers found that after implementing various community engagement activities, breastfeeding support improved significantly; for instance, a local hospital gained Baby-Friendly status and created designated areas for breastfeeding. This matters because better breastfeeding support leads to healthier mothers and babies, and helps businesses understand their role in this process.
Who this helps: This helps mothers, healthcare providers, and local businesses.
Multi-provincial Salmonellosis Outbreak Related to Newly Hatched Chicks and Poults: A Genomics Perspective.
2017
PLoS currents
Croxen MA, Macdonald KA, Walker M, deWith N, Zabek E +6 more
Plain English This research looked into a Salmonella outbreak linked to newly hatched chicks and poults in several provinces in Canada during 2015, which resulted in 61 confirmed human cases. By using advanced genome sequencing alongside traditional methods, researchers found that nearly all the human cases were of a specific type of Salmonella (Phage Type 13a), and they were able to distinguish outbreak-related bacteria more accurately than with conventional methods. This is important because it helps public health officials quickly identify and manage sources of contamination, which can prevent further illness.
Who this helps: This research benefits public health officials and farmers by improving food safety practices.
The Impact of Multilocus Variable-Number Tandem-Repeat Analysis on PulseNet Canada Escherichia coli O157:H7 Laboratory Surveillance and Outbreak Support, 2008-2012.
2016
Foodborne pathogens and disease
Rumore JL, Tschetter L, Nadon C
Plain English This study looked at how well a new DNA testing method called multilocus variable-number tandem-repeat analysis (MLVA) works alongside an older method, pulsed-field gel electrophoresis (PFGE), for tracking E. coli O157:H7 infections in Canada from 2008 to 2012. Researchers found that using MLVA improved the ability to identify linked cases by better distinguishing between different strains of the bacteria in 60% of cases, although it did not change the results for about 40% of cases. This is important because it enhances the accuracy of tracking and controlling outbreaks of E. coli, which can help prevent foodborne illnesses.
Who this helps: This benefits public health officials and healthcare providers working to manage and prevent outbreaks of E. coli infections.
Using Simulation to Improve Student and Faculty Knowledge of Telehealth and Rural Characteristics.
2016
Nursing education perspectives
Mennenga HA, Johansen L, Foerster B, Tschetter L
Plain English This study looked at how much senior nursing students and their teachers knew about telehealth and rural nursing before and after they took part in a new training simulation. After the simulation, both groups showed a significant increase in their knowledge, indicating that this kind of training is effective. This matters because improving understanding of telehealth can help better prepare healthcare providers to meet the needs of patients in rural areas.
Who this helps: This helps nursing students and educators.
Policies aren't enough: the importance of interpersonal communication about workplace breastfeeding support.
2015
Journal of human lactation : official journal of International Lactation Consultant Association
Anderson J, Kuehl RA, Drury SA, Tschetter L, Schwaegerl M +5 more
Plain English This study looked at how conversations between employees and managers influence workplace support for breastfeeding. Researchers held discussions with 23 business representatives and found that personal communication is often more effective than written policies for implementing breastfeeding support. They also discovered that factors like age, gender, and workplace hierarchy can make these conversations challenging, but positive communication strategies can lead to better breastfeeding support in the workplace.
Who this helps: This benefits breastfeeding employees and their managers in local businesses.
Multi-Province Listeriosis Outbreak Linked to Contaminated Deli Meat Consumed Primarily in Institutional Settings, Canada, 2008.
2015
Foodborne pathogens and disease
Currie A, Farber JM, Nadon C, Sharma D, Whitfield Y +38 more
Plain English In 2008, a listeriosis outbreak in Canada infected 57 people and led to 24 deaths, with most cases occurring in long-term care facilities and hospitals. The source was traced back to deli meats from one manufacturer that were mainly bought by institutions, highlighting serious food safety issues. The findings show the urgent need for better monitoring and control of Listeria in ready-to-eat foods, especially for vulnerable groups.
Who this helps: This helps patients in care facilities and the healthcare providers serving them.
Student Perceptions of Quality and Safety Competencies.
2015
International journal of nursing education scholarship
Mennenga HA, Tschetter L, Sanjaya L
Plain English The study looked at how ready senior nursing students felt to use important skills for providing safe and quality health care, as outlined by the Quality and Safety Education in Nursing (QSEN) project. It found that students felt somewhat prepared to perform all the relevant skills and viewed them as at least somewhat important. This research helped the nursing program identify areas that need more focus and led to changes in their teaching curriculum.
Who this helps: This benefits nursing students and educators by improving their training and curriculum.
The utility of multiple molecular methods including whole genome sequencing as tools to differentiate Escherichia coli O157:H7 outbreaks.
2015
Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin
Berenger BM, Berry C, Peterson T, Fach P, Delannoy S +6 more
Plain English This study examined different genetic testing methods to identify outbreaks of a harmful E. coli strain called O157:H7 in Alberta, Canada. Researchers found that traditional tests couldn’t effectively tell apart germs from outbreaks in 2012 and 2014, while newer methods like k-mer analysis were more successful in doing so. This is important because accurately identifying outbreak sources can help prevent future infections and protect public health.
Who this helps: This benefits public health officials and healthcare providers who manage and respond to foodborne illness outbreaks.
Team-based learning: an innovative approach to teaching maternal-newborn nursing care.
2013
The Journal of nursing education
Lubeck P, Tschetter L, Mennenga H
Plain English This study looked at a new teaching method called team-based learning in a nursing program focused on maternal and newborn care. The researchers found that this approach actively engaged students and improved their understanding of the material compared to traditional lectures. This matters because better training for nurses can lead to improved care for mothers and babies.
Who this helps: This benefits nursing students and ultimately the mothers and newborns they care for.
Plain English This study looked at a seminar course for first-year nursing students to help them adjust to college life. The researchers found that students who took the course felt more prepared for their nursing studies and had a better understanding of what being a nurse involves. This matters because starting college can be challenging, and proper support can enhance students' success in their nursing careers.
Who this helps: This benefits nursing students as they begin their college journey.
Prevalence of negative birth perception, disaffirmation, perinatal trauma symptoms, and depression among postpartum women.
2010
Perspectives in psychiatric care
Sorenson DS, Tschetter L
Plain English This study looked at how many new mothers feel negatively about their birth experiences, face trauma symptoms, and suffer from depression about six to seven months after giving birth. It found that 9.6 out of every 100 mothers had negative perceptions of their births, 10.2 experienced trauma symptoms, 8.6 felt disaffirmed by their healthcare providers, and 15.7 were depressed. These numbers indicate a significant need for better support and care for women after childbirth.
Who this helps: This helps postpartum women and healthcare providers who support them.
Clinical academic partnership: mutual ownership for clinical learning.
2010
Nurse educator
Hegge M, Bunkers S, Letcher D, Craig G, Klawiter R +3 more
Plain English This study focused on improving clinical training for nursing students by creating partnerships between academic institutions and healthcare providers. The researchers found that connecting students directly with clinical experts enhances their learning opportunities, making use of limited resources more effectively. This is important because quality clinical experiences are crucial for preparing competent nurses in a demanding healthcare environment.
Who this helps: This benefits nursing students and healthcare providers.
Isolation and detection of Shiga toxin-producing Escherichia coli in clinical stool samples using conventional and molecular methods.
2009
Journal of medical microbiology
Gilmour MW, Chui L, Chiu T, Tracz DM, Hagedorn K +4 more
Plain English Researchers studied how to effectively identify harmful strains of E. coli that produce Shiga toxin (STEC) in stool samples from children with gastroenteritis. They tested 876 samples and found 45 that likely contained STEC, isolating 20 strains of O157 and 22 strains of non-O157 STEC types. This work matters because it improves our ability to detect and categorize different STEC strains, which is essential for patient diagnosis and treatment, especially when multiple infections occur at once.
Who this helps: This helps doctors and healthcare providers in diagnosing and treating pediatric patients with gastrointestinal infections.
Journal of professional nursing : official journal of the American Association of Colleges of Nursing
Fahrenwald NL, Bassett SD, Tschetter L, Carson PP, White L +1 more
Plain English This study looked at how nursing schools teach essential values that help nurses provide compassionate care to patients. It highlighted five key values: respect for human dignity, honesty, the right to make decisions, selflessness, and fairness. Teaching these values is crucial because they shape how nurses interact with patients and improve the overall quality of care.
Who this helps: This helps nursing students and future patients by ensuring that nurses are trained to provide empathetic and ethical care.
Grief enriched us: a model of perinatal loss support.
2005
The Journal of perinatal education
Tschetter L, Hildreth M
Plain English This study looked at how keeping mothers and their babies together, even after a loss during pregnancy or shortly after birth, can help families deal with their grief. The researchers found that this approach improves family bonds and creates positive memories, which can be important for healing. This matters because it shows that supportive care during difficult times can help families cope better.
Who this helps: This helps families experiencing perinatal loss.
Results of a planned interim toxicity analysis with trimodality therapy, including carboplatin AUC = 4, paclitaxel, 5-fluorouracil, amifostine, and radiation for locally advanced esophageal cancer: preliminary analyses and treatment recommendations from the North Central Cancer Treatment Group.
2004
International seminars in surgical oncology : ISSO
Jatoi A, Martenson J, Mahoney MR, Lair BS, Brindle JS +5 more
Plain English This study looked at a new treatment plan for patients with advanced esophageal cancer, using a combination of medications and radiation to reduce side effects while still aiming for effective results. Out of the first ten patients treated, six had no signs of cancer after the therapy, but all needed adjustments to their treatment due to side effects, and one person experienced a severe allergic reaction. The findings suggest that using a lower dose of carboplatin is suitable for these patients, potentially making the treatment safer.
Who this helps: This helps patients with advanced esophageal cancer by offering a safer treatment option.
Plain English This study focused on improving the identification of nontuberculous mycobacteria (NTM) by using a specific gene sequence known as 16S rRNA. The researchers created a database using samples from 121 strains and found that 61 of these had a perfect match to known species, while others showed slight differences or were completely new sequences. This matters because having an accurate and quality-controlled database helps labs correctly identify these bacteria, which is important for diagnosing and treating infections effectively.
Who this helps: This helps patients and doctors by providing better tools for diagnosing NTM infections.
Channel specificity and secondary structure of the glucose-inducible porins of Pseudomonas spp.
1998
Journal of bioenergetics and biomembranes
Adewoye LO, Tschetter L, O'Neil J, Worobec EA
Plain English This study looked at how certain bacteria, specifically Pseudomonas species, transport glucose across their cell membranes using a protein called porin. Researchers found that the porin system is very effective, with a low threshold for glucose, meaning it can start working well even at very low levels (0.3-5 microM), and it mainly focuses on glucose. Understanding how these bacteria absorb glucose could help improve treatments for infections caused by them.
Who this helps: This benefits doctors treating patients with infections from Pseudomonas bacteria.
Reasons for employment or non-employment during pregnancy.
1994
Health care for women international
Sorenson DL, Tschetter L
Plain English This study looked at why pregnant women decide to work or not during their pregnancy by analyzing data from 210 women. It found that many women work because they want to feel fulfilled, interact with others, and maintain their career identity, while those who choose not to work often cite pregnancy-related health issues and family responsibilities. Understanding these reasons can help provide better support and advice for pregnant women facing employment decisions.
Who this helps: This benefits pregnant women and healthcare providers who support them.
Epidemiologic features of pain in pediatric cancer patients: a co-operative community-based study. North Central Cancer Treatment Group and Mayo Clinic).
1991
The Clinical journal of pain
Elliott SC, Miser AW, Dose AM, Betcher DL, O'Fallon JR +5 more
Plain English This study looked at pain experienced by children with cancer at the Mayo Clinic and other hospitals. Out of 160 children surveyed, 28 reported pain; most of this pain (about 58%) was caused by side effects from their cancer treatment, while 21% was not related to cancer or its treatment. This is important because it highlights that children's pain is often tied to treatments rather than the cancer itself, which can guide better management strategies.
Who this helps: This helps pediatric patients and their doctors by improving pain management approaches.