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Home » Authors » Stelios Viazis Ph.D.

Stelios Viazis Ph.D.

Stelios Viazis, Ph.D., is a member of FDA’s CORE Network and part of the CORE Outbreak Analytics team. Previously, he served as a member of CORE Response, where he coordinated outbreak response efforts as well as the FDA Produce Safety Network, where he served as a Western Region subject-matter expert on the Produce Safety Rule. 

Articles

ARTICLES

ice cream with berries

Outbreaks of Foodborne Illnesses and Recalls Associated With Ice Cream and Frozen Dessert Products

Reports in the literature indicate that ice cream has been associated with illnesses linked to numerous pathogens, including Listeria, which can cause severe illness
Brett Weed M.P.H., M.S. Karunya Manikonda M.P.H. Allison Wellman M.P.H. Greg Gharst Ph.D. Matthew Doyle D.V.M., M.P.H. Amanda Conrad M.P.H. Alexandra Palacios M.P.H. Melanie LaGrossa M.P.H. Stelios Viazis Ph.D.
July 1, 2024

Ice cream has historically been associated with human cases of infection by various foodborne pathogens. Pathogen introduction into ice cream can occur at various points throughout the production process for a range of reasons, which can be addressed through proper food safety controls. 


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workers in an office

The Evolution of FDA CORE: Adaptive Response to Outbreak-Related Challenges

Since the CORE Network was established in 2011, its dedicated staff has worked to adapt to an ever-changing foodborne illness outbreak investigation landscape
Stelios Viazis Ph.D. Christina K. Carstens Ph.D., M.S. Lindsay Walerstein, M.P.H. Marie Armstrong M.P.H. Angela Fields M.P.H. Tyann Blessington Ph.D., M.S., M.P.H. Cerisé Hardy M.P.H. Sharon Seelman M.S., M.B.A. Brett Weed M.P.H., M.S.
February 13, 2024

The primary role of FDA's Coordinated Outbreak Response and Evaluation (CORE) Network is to conduct outbreak surveillance, manage the response efforts, and initiate post-outbreak activities for incidents involving FDA-regulated products. This article explores the evolution, work, and perpetual improvement of the CORE Network.


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cashew milk

A Review of Outbreak Investigations of Salmonella Infections Associated with Cashews and Cashew-Containing Food Products in the U.S.

Salmonella spp. have long been associated with low-moisture foods such as nuts and nut-derived products
Margaret Kirchner Ph.D. Gordon R. Davidson Ph.D. Julia Mangia M.P.H. Spencer Carran Ph.D. Andrea J. Krause Ph.D. Karunya Manikonda M.P.H. Zachary D. McCormic M.P.H. Laura Gieraltowski Ph.D. Katherine E. Marshall M.P.H. Stelios Viazis Ph.D.
August 8, 2023

Salmonella spp. have long been associated with low-moisture foods such as nuts and nut-derived products, with varying prevalence observed in tree nuts, including cashews, at retail. Virtually all cashews are imported to the U.S. Some nuts, including cashews, are imported as a "raw" product (i.e., one that has not been subjected to a process to adequately reduce pathogens, such as a kill step). Salmonella contamination of such products has resulted in several notable outbreaks in the U.S. in the past ten years, including those in which cashew-containing products have been implicated as a vehicle. This article presents a brief overview of outbreak investigations of Salmonella infections linked to the consumption of cashews and cashew-containing food products. It also presents challenges encountered, lessons learned, and relevant regulatory requirements for importers and manufacturers of cashews and cashew-containing products.


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Soft Queso Fresco Type Cheese

Recent Outbreaks of Listeriosis Linked to Fresh, Soft Queso Fresco-Type Cheeses in the U.S.

Since 2000, outbreaks have been attributed to fresh, soft Queso Fresco-type cheeses made from pasteurized milk, which have been contaminated by L. monocytogenes after pasteurization
Evelyn Pereira M.P.H. Cerisé Hardy M.P.H. Melinda Hayman Ph.D. Amanda Conrad M.P.H. Alexandra Palacios M.P.H. Stelios Viazis Ph.D.
February 6, 2023

This article presents the key findings of outbreak investigations from 2014–2021 that have been linked to the consumption of fresh, soft queso fresco-type cheeses in the U.S. The authors outline some of the specific circumstances that small manufacturers of all cheeses may encounter in an effort to provide lessons learned and highlight available resources.


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lab workers

The Incident Command System and Foodborne Illness Outbreak Investigations

The Coordinated Outbreak Response and Evaluation (CORE) Network is the coordination focal point for all FDA resources during outbreak investigations
Stelios Viazis Ph.D. Sharon Seelman M.S., M.B.A. Kari Irvin M.S. Julia Mangia M.P.H.
October 11, 2022

During foodborne illness outbreak investigations, public health and regulatory authorities collect three types of data to determine a common food consumed by ill people: epidemiologic, traceback, and laboratory. State and local partners work with FDA to conduct traceback investigations and examine the food supply chain to determine the origin of the foods identified by the epidemiologic investigations. This article looks at the benefits of using incident command system (ICS) principles during emergency response coordination activities for foodborne illness outbreaks, with input from members of the FDA's CORE Network.


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Outbreak Investigations of Cyclospora cayetanensis Infections

Outbreak Investigations of Cyclospora cayetanensis Infections 2013–2020: Progress Made and Challenges Remaining

Recurring outbreaks of cyclosporiasis underscore the need for a comprehensive understanding of how Cyclospora cayetanensis contaminates water and produce
Stelios Viazis Ph.D. Fazila Shakir M.H.S. Anne Straily D.V.M. Adrienne Goodrich-Doctor Ph.D. Jeffery L. Sumter Dr.P.H. Socrates Trujillo Ph.D.
April 20, 2022

FDA Coordinated Outbreak Response and Evaluation Network (CORE), in collaboration with the U.S. Centers for Disease Control and Prevention (CDC), and state and local public health and regulatory partners, conduct foodborne illness outbreak investigations, including those related to Cyclospora cayetanensis infections. In this article, the authors review the successes and challenges of identifying and responding to outbreaks caused by C. cayetanensis infections since 2013, the progress made, the challenges remaining, and what the future holds.


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sprouts

An Overview of Historic Foodborne Illness Outbreak Investigations Linked to the Consumption of Sprouts: 2012–2020

Sprout production is inherently conducive to the survival and growth of pathogens
Michael C. Bazaco Ph.D. Stelios Viazis Ph.D. Donald C Obenhuber Ph.D. Patricia Homola Ph.D Fazila Shakir M.H.S. Angela Fields M.P.H.
June 17, 2021
This article outlines the identification of and responses to these outbreaks, the actions taken to prevent future outbreaks, the challenges encountered, possible contamination routes, and how current regulations may affect sprout safety.
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pathogen image

Regulatory Report: Outbreak Investigations of Foodborne Illnesses Linked to Atypical Food-Pathogen Pairs

Lessons learned help drive future response and prevention efforts
Stelios Viazis Ph.D. Michael C. Bazaco Ph.D. Douglas Karas M.A.
January 14, 2021

After a foodborne outbreak is identified, specific food vehicles may become the focus of an investigation based on the pathogen implicated and past outbreaks linked to the pathogen. 


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