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According to a study published in the journal Nature Microbiology on July 15th, the National Atlas will tell scientists where Listeria and other related species live in surrounding areas of the United States, which may help Scientists track and determine the source of Listeria found in ingredients, food processing facilities and finished products
.
"When we tried to identify the risk of Listeria from the soil and from different locations, our team created a more systematic method to assess the frequency of different Listeria bacteria in different locations," Food Safety College of Agriculture and Life Sciences And food science professor Martin Wiedmann said
.
"We studied Listeria in different regions such as New York, Colorado, and California, but before this atlas, it was difficult to compare and evaluate the diversity of Listeria in different regions
Listeria monocytogenes in food can make people extremely sick
.
The Centers for Disease Control and Prevention (CDC) estimates that 1,600 people in the United States are infected with listeriosis each year; approximately 260 of them die
Knowing that Listeria is naturally present in the soil, the Cornell University research team asked hundreds of scientists across the country to collect soil samples from generally undisturbed places in nature, such as the areas outside the trails of state parks and national parks
.
From these samples, the team developed a nationwide atlas of 1,854 Listeria isolates, representing 12 families and 594 strains of bacteria called phylogenetic groups
.
The first author of the paper, Jingqiu Liao, was a graduate student in Wiedmann's laboratory and is now a postdoctoral researcher at Columbia University
.
She supplemented her research by obtaining soil samples during her travels and found that Listeria is present in various environmental environments
"The goal of this work is to systematically collect soil samples from all over the United States," Liao said, "and capture the large-scale spatial distribution, genomic diversity, and population structure of Listeria species in the natural environment
.
"
"Through whole-genome sequencing and comprehensive population genome analysis," Liao said, "we provide answers to the ecological and evolutionary drivers of bacterial genome flexibility-this is an important open question in the field of microbiology
.
"
Liao explained that this work can be used as a reference for future population genomics research, and may benefit the food industry by locating contamination with Listeria from natural sources
.
Jingqiu Liao, Xiaodong Guo, Daniel L.
Weller, Shaul Pollak, Daniel H.
