Listeria outbreaks have gotten fairly widespread with time. A brand new examine has discovered disturbing proof that the usually “innocent” pathogen is growing doubtlessly dangerous traits at an alarming tempo. What’s extra, the micro organism had been collected from meat samples within the meals processing amenities.
A pressure of the microbe, Listeria monocytogenes, is usually discovered within the meals processing business and is dangerous to people. It not solely causes extreme sickness, however additionally it is turning into more and more immune to meals security measures taken all over the world.
Worryingly, two totally different innocent species of Listeria had been discovered to own genetic modifications which may be dangerous to people, SciTechDaily reported.
The Complete Genome Sequencing examine in South Africa, led by a workforce of researchers on the College of Johannesburg, discovered a number of the altering traits of Listeria discovered within the nation.
The examine, printed within the journal Microbiology Spectrum, confirmed that Listeria innocua strains are growing resistance to stresses comparable to temperature, pH, and dehydration. Additionally, hypervirulence noticed within the strained is genetically similar to that of Listeria monocytogenes.
“The Listeria innocua that we examined has a number of the genes which can be additionally present in pathogenic Listeria monocytogenes,” lead creator, Dr. Thendo Mafuna from the Division of Biochemistry on the College of Johannesburg mentioned. These shared genes may cause illness in people and induce stress tolerance to the disinfectant Benzalkonium chloride (BC or BAC).
Furthermore, some strains of L. innocua and L. welshimeri had all three genes immune to the widely-used disinfectant from the quaternary ammonium compound (QAC or QUAT) group of chemical substances, the examine discovered.
“Huge industrial meals processors could wish to examine how environment friendly BC or quat disinfectants are of their amenities. This may be finished by taking swabs earlier than cleansing and once more after cleansing, culturing these, to see how properly the disinfectant regimes are working,” Mafuna famous, in response to the outlet.
The 2 non-pathogenic strains of Listeria had been present in samples taken from uncooked, dried and processed meats at industrial meals processing amenities within the nation.
For the examine, 258 strains from butcheries, abbatoirs, shops, chilly shops, and processing amenities from throughout the nation had been analyzed. Of the samples, 38 of them had been discovered to be nonpathogenic L. Innocua and three had been nonpathogenic L. welshimeri.
“We have to have a look at our personal amenities in South Africa to essentially see what is occurring. Our analyses of those micro organism may also help us predict which sequence sorts to be looking out for,” Mafuna commented.
Final yr, a listeria outbreak affected 10 states within the U.S. The Facilities for Illness Management and Prevention (CDC) issued a proper meals security alert on Huge Olaf Creamery ice cream merchandise. Based mostly on the map the CDC posted on-line, the Listeria instances had been reported within the following states: Florida, Georgia, Illinois, Kansas, Colorado, Minnesota, Pennsylvania, New York, Massachusetts, and New Jersey.