article · Nature Genetics
Salmonella enterica serovar Enteritidis presents distinct disease profiles globally. In high-income regions, it causes self-limiting enterocolitis linked to poultry and industrial egg production. In contrast, in sub-Saharan Africa, it represents a primary cause of bloodstream-invasive nontyphoidal Salmonella disease, which carries high case fatality rates. Genomic analysis of 675 isolates across 45 countries reveals the genetic basis for this divergence. Alongside a global epidemic clade, two novel clades exist that are geographically confined to specific African regions. These African lineages exhibit genomic degradation, unique prophage repertoires, and an expanded multidrug resistance plasmid. These genetic characteristics demonstrate niche plasticity within the serotype, explaining how distinct lineages evolved to cause either mild foodborne gastroenteritis or severe, invasive, drug-resistant infections in African settings.
Understanding why a pathogen causes mild food poisoning in some areas but life-threatening bloodstream infections in others is vital for public health. Identifying the specific genetic changes and drug-resistance elements unique to African lineages helps explain the severity of invasive disease in the region and provides essential biological insight into how bacteria adapt to different environments and transmission routes.
This early-stage genomic research does not directly present a commercial product, but its findings on specific African clades and their multidrug resistance plasmids could inform diagnostic developers and surveillance initiatives. Understanding these distinct genomic profiles may support future diagnostic tools tailored to detect invasive, drug-resistant African strains. However, the abstract does not describe any tested applications or immediate translation pathways, leaving the work at an early discovery stage.
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An epidemiological paradox surrounds Salmonella enterica serovar Enteritidis. In high-income settings, it has been responsible for an epidemic of poultry-associated, self-limiting enterocolitis, whereas in sub-Saharan Africa it is a major cause of invasive nontyphoidal Salmonella disease, associated with high case fatality. By whole-genome sequence analysis of 675 isolates of S. Enteritidis from 45 countries, we show the existence of a global epidemic clade and two new clades of S. Enteritidis that are geographically restricted to distinct regions of Africa. The African isolates display genomic degradation, a novel prophage repertoire, and an expanded multidrug resistance plasmid. S. Enteritidis is a further example of a Salmonella serotype that displays niche plasticity, with distinct clades that enable it to become a prominent cause of gastroenteritis in association with the industrial production of eggs and of multidrug-resistant, bloodstream-invasive infection in Africa.
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DOI: 10.1038/ng.3644
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