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New Salmonella Serotype Discovered

23 February 2015

Lubbock is known for many things. Some of them are reasons to celebrate, like being the home of Buddy Holly. Some portray the city in negative ways, like dust storms.

The latest honour to come Lubbock’s way may not sound good at first, but when realising it’s a breakthrough in biological sciences, it will become something to brag about.

Marie Bugarel, a research assistant professor at Texas Tech University’s Department of Animal and Food Sciences in the College of Agricultural Sciences and Natural Resources, has discovered a new serotype of the salmonella bacteria.

The new serotype was confirmed by the Pasteur Institute in Paris, the international reference centre for salmonella.

Because convention calls for a new serotype to be named after the city in which it is discovered, this one will be called Salmonella Lubbock (officially Salmonella enterica subsp. enterica Lubbock).

“More important than the name, however, is that this discovery illustrates there is more that needs to be discovered about salmonella and how it interacts with cattle populations,” said Guy Loneragan, a professor of food safety and public health who, along with Kendra Nightingale, are Bugarel’s mentors at Texas Tech.

“With this understanding will come awareness of how to intervene to break the ecological cycle and reduce salmonella in animals and in beef, pork and chicken products.”

Prof Marie Bugarel

Prof Bugarel, who came to Texas Tech with an extensive background in salmonella research, has worked on developing new tools to detect salmonella, new approaches to distinguish serotypes and ways to understand salmonella’s biology.

Her work has led to a patent application that has been licensed to a high-tech biosciences research company.

Her invention means it is now possible to simultaneously detect and distinguish specific strains of salmonella by targeting a specific combination of DNA.

That will allow for early detection in food while also identifying whether or belongs to a highly pathogenic strain.

In her research for Salmonella Lubbock, the impetus was to reduce salmonella in food and improve public health.

She focused on providing solutions to control salmonella in cattle population, which led to a better understanding of the biological makeup of salmonella itself, including its genetic makeup.

Through this approach, Prof Bugarel discovered the new strain never before described.

The long-held standard way of distinguishing one strain of salmonella from another is called serotyping and is based on the molecules on the surface of the bacterium.

Each serotype has its own pattern of molecules, called antigens, and the collection of molecules provides a unique molecular appearance.

These antigens interact with certain antibodies found in specifically prepared serum, thus providing the serotype. It is similar to how blood typing is performed.

“This discovery reinforces my feeling that the microbiological flora present in cattle in the United States harbours a singularity, which is an additional justification of the research we are doing in the International Center for Food Industry Excellence (ICFIE) laboratories at Texas Tech,” Prof Bugarel said.

“Additional research will be performed to better describe the characteristics of this atypical bacterial flora and, more specifically, of the Lubbock serotype.”

Prof Guy Loneragan

With this discovery, Prof Loneragan believes between 20 and 30 per cent of two current strains, Salmonella Montevideo and Salmonella Mbandaka, will be reclassified as Salmonella Lubbock.

The algorithm used in serotyping has some stopping points, but Prof Bugarel discovered a need to go a step further to get the correct strain name. Therefore some of those strains called Montevideo and Mbandaka are now Salmonella Lubbock.

Some of the strains of Salmonella Lubbock fall into the category of serotype patterns that are more broadly resistant to many families of antibiotics, furthering the need for more research on the subject. Human susceptibility to the Lubbock strains remains unknown.

“We will continue to develop methods to detect, identify and control the presence of pathogenic microorganisms in food products in order to improve food safety and public health,” Prof Bugarel said.

“Kendra and I have been honored to serve as Marie’s mentors,” Prof Loneragan said.

“But now, the growth in Marie’s expertise means that she is becoming the mentor to us.

“Many students, and the citizens of the United States in general and Texas in particular, are benefitting from her commitment to research excellence at Texas Tech. We are very lucky to have her.”

February 2015

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