A One Health Perspective on Salmonella enterica Serovar Infantis, an Emerging Human Multidrug-Resistant Pathogen.

Salmonella enterica serovar Infantis presents an ever-increasing threat to public health because of its spread throughout many countries and association with high levels of antimicrobial resistance (AMR). We analyzed whole-genome sequences of 5,284 Salmonella Infantis strains from 74 countries, isolated during 1989-2020 from a wide variety of human, animal, and food sources, to compare genetic phylogeny, AMR determinants, and plasmid presence. The global Salmonella Infantis population structure diverged into 3 clusters: a North American cluster, a European cluster, and a global cluster.

Enteric fever cluster identification in South Africa using genomic surveillance of serovar Typhi.

The National Institute for Communicable Diseases in South Africa participates in national laboratory-based surveillance for human isolates of species. Laboratory analysis includes whole-genome sequencing (WGS) of isolates. We report on WGS-based surveillance of serovar Typhi ( Typhi) in South Africa from 2020 through 2021.

Outbreak of Listeriosis in South Africa Associated with Processed Meat.

Background: An outbreak of listeriosis was identified in South Africa in 2017. The source was unknown.

Methods: We conducted epidemiologic, trace-back, and environmental investigations and used whole-genome sequencing to type isolates.

Laboratory characterisation of Salmonella enterica serotype Typhi isolates from Zimbabwe, 2009-2017.

Background: Typhoid fever remains a major public health problem in Zimbabwe with recurrent outbreaks reported since 2009. To provide guidance on appropriate treatment choice in order to minimise the morbidity and mortality of typhoid fever and prevent large scale outbreaks, we investigated the antimicrobial susceptibility patterns, prevalence of Salmonella enterica serotype Typhi (S. Typhi) H58 haplotype and molecular subtypes of S.

Outbreak of in South Africa, 2017-2018: Laboratory Activities and Experiences Associated with Whole-Genome Sequencing Analysis of Isolates.

In South Africa, a progressive increase in listeriosis cases was noted from mid-June 2017, heralding what was to become the world's largest listeriosis outbreak. A total of 1060 cases were reported for the period January 1, 2017 to July 17, 2018. We describe laboratory activities, experiences, and results of whole-genome sequencing (WGS) analysis of s isolates associated with this outbreak.

Whole-Genome Sequences of Listeria monocytogenes Sequence Type 6 Isolates Associated with a Large Foodborne Outbreak in South Africa, 2017 to 2018.

We report whole-genome sequences for 10 sequence type 6 isolates associated with a large listeriosis outbreak in South Africa, which occurred over the period of 2017 to 2018. The possibility of listeriosis spreading beyond South Africa's borders as a result of exported contaminated food products prompted us to make the genome sequences publicly available.

Laboratory-acquired infections of Salmonella enterica serotype Typhi in South Africa: phenotypic and genotypic analysis of isolates.

Background: Workers in clinical microbiology laboratories are exposed to a variety of pathogenic microorganisms. Salmonella species is among the most commonly reported bacterial causes of laboratory-acquired infections. We report on three cases of laboratory-acquired Salmonella enterica serotype Typhi (Salmonella Typhi) infection which occurred over the period 2012 to 2016 in South Africa.

Genome Sequences for a Cluster of Human Isolates of Listeria monocytogenes Identified in South Africa in 2015.

Listeria monocytogenesis a Gram-positive bacterium with a ubiquitous presence in the environment. There is growing concern about the increasing prevalence ofL. monocytogenesassociated with food-borne outbreaks.