Upon comparing the proteomes of STM and SENT, 465 core proteins were detected, of which 192 were differentially expressed between the two serovars. Ethical approval for the Microbiological Surveillance was granted by the Institutional Review Board at the ITM in Antwerp, by the Ethics Committees of the Antwerp University (Belgium).

For each serovar, five clinical isolates (covering different geographical origins) and one reference strain were grown in vitro to the exponential phase. Protein detection in technical replicates showed Pearson correlation coefficients higher than 0.92 for all samples, except for the STM strain from Ethiopia with a Pearson correlation of 0.86 (S2 Table).
Vaccination is recommended for those traveling to endemic areas at high risk for typhoid fever, including South-central and Southeast Asia, South America, Latin America, Africa, and the Caribbean. The regulator proteins InvJ and PrgI are known to be involved in needle and inner rod assembly [46], while SipA induces actin cytoskeletal rearrangements [47] and the translocases SipB and SipC form a translocation pore into the host cell membrane which is connected to the needle complex [48]. The partner institutes involved in this surveillance project that provided strains were: Sihanouk Hospital Centre of Hope, Phnom Penh, Cambodia and Institut National de Recherche Biomédicale, Kinshasa, Democratic Republic of the Congo. In this study we have investigated differential expression of the core proteomes of the Salmonella serovars Typhi, Paratyphi A, Typhimurium and Enteritidis, as well as the regulating molecules. In the case of low numbers of organisms, enrichment using tetrathionate and selenite enrichment broths can be used. No, PLOS is a nonprofit 501(c)(3) corporation, #C2354500, based in San Francisco, California, US, https://doi.org/10.1371/journal.pntd.0007416, http://bioinformatics.intec.ugent.be/phenetic/#/index, http://bioinformatics.intec.ugent.be/phenetic/index.html#/network, http://www.who.int/immunization/policy/position_papers/typhoid/en/.

Studies indicate that S. typhimurium has been able to initiate an immune response as a direct result of … Antimicrobial therapy to prevent bacteremia, which occurs in less than 5% of patients, should be considered for those younger than 3 months of age, those older than 50 years of age who have atherosclerosis because of the risk for endovascular infection, those with prosthetic devices, immunosuppression, arthritis, or other endovascular abnormalities.

The human restricted serovar Typhi (STY) and the closely related serovar Paratyphi A (SPTA) cause enteric fever [1], while the generalist serovars Typhimurium (STM) and Enteritidis (SENT) are the most important causes of non-typhoidal salmonellosis [2]. 78 out of 192 differentially expressed proteins are shown in the sub-network. Individuals with HIV and a first episode of bacteremia should be treated with oral therapy for 6 weeks. Then, the LFQ intensities were log2 transformed and data were filtered for proteins containing a minimum number of valid values in 9 out of 12 samples.

[16], "Birth order, maternal age, and mental retardation", "Patterns of genome evolution that have accompanied host adaptation in Salmonella", "Outbreak of Salmonella javiana infection at a children's hospital", "Typhoid Outbreak in Pakistan Linked to Extensively Drug-Resistant Bacteria", "Emergence of an Extensively Drug-Resistant Salmonella enterica Serovar Typhi Clone Harboring a Promiscuous Plasmid Encoding Resistance to Fluoroquinolones and Third-Generation Cephalosporins", "Extensively Drug-Resistant Typhoid Fever in Pakistan - Alert - Level 2, Practice Enhanced Precautions - Travel Health Notices | Travelers' Health | CDC", "Comparative analysis of Salmonella genomes identifies a metabolic network for escalating growth in the inflamed gut", "Invasive non-typhoidal salmonella disease: an emerging and neglected tropical disease in Africa", https://en.wikipedia.org/w/index.php?title=Salmonella_enterica_subsp._enterica&oldid=981595139, Creative Commons Attribution-ShareAlike License, Humans, cattle, swine, sheep, horses, rodents, galliformes, This page was last edited on 3 October 2020, at 08:59. Thanks for visiting Infectious Disease Advisor.

Methodology, Three currently available typhoid vaccines are recommended by the WHO: an oral vaccine based on a live attenuated mutant strain of STY Ty21a (Ty21a), the injectable Vi capsular polysaccharide (ViCPS) vaccine and the typhoid conjugate vaccine (TCV) (http://www.who.int/immunization/policy/position_papers/typhoid/en/). How do patients contract salmonellosis, and how do I prevent spread to other patients?

Besides their role in motility, flagellins were shown to stimulate both the innate and adaptive immune system and to cause inflammation upon STM infection [49]. No, Is the Subject Area "Salmonella" applicable to this article? Already have an account?

It is updated every two years. Our insights may guide future developed of novel diagnostics and vaccines, and understanding of disease progression. Formal analysis, However, in order to conduct reliable intra-serovar comparisons, more strains should have been included per serovar. This metabolic advantage might have a role in competing with other bacteria in the inflamed gut, thereby enhancing transmission of the gastrointestinal pathogens [11]. Data curation, For matching, a retention time window of 42 s was selected.
A number of serologic tests for S. typhi have been developed, among which the most widely used is the Widal test, but it is neither sensitive nor specific and is not recommended.

The incidence of non-typhoidal Salmonella infections continues to increase worldwide and has doubled during the last 2 decades in the United States. In research, proteomics was used to characterize the proteomes of Salmonella Typhimurium and Enteritidis under specific in vitro culture conditions mimicking the phagosome [14,15], to identify proteins that were expressed by Salmonella Typhimurium isolated from infected macrophages [16], and to study antimicrobial resistance and virulence in Salmonella Typhimurium [17–19].

Moreover, growth temperatures ranged between 35°C and 37°C and may have impacted expression levels. Finally, the aim of our study was to conduct a comparative analysis of orthologous proteins shared between the four Salmonella serovars, and as such, we do not present information on serovar-specific (non-orthologous) proteins. Funding: This work was supported by the Flemish Ministry of Sciences (EWI, SOFI project IDIS) (SD) and the InBev-Baillet Latour (IBL) (SD) Fund. Protein quantification was based on the MaxQuant label-free (MaxLFQ) algorithm. Software,

Methodology, Writing – review & editing, Affiliations In addition, our mass spectrometry set-up is not as sensitive as the newest instruments currently available, and we captured around 20 to 40% of the proteomes.

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Both humoral- and cell-mediated immunity are required for protection against Salmonella. No sponsor or advertiser has participated in, approved or paid for the content provided by Decision Support in Medicine LLC.

However, PCA of the LFQ intensities of the 418 detected proteins shared by all four serovars did not separate the typhoidal from the non-typhoidal serovars. In total, 418 orthologous proteins were detected in all serovars (Fig 1) and expression levels in the typhoidal (STY and SPTA) and non-typhoidal (STM and SENT) Salmonella serovars were compared by PCA of the LFQ intensities (Fig 2A). The first two components capture ~72% of the variability in the dataset and show that the typhoidal serovars do not separate from the non-typhoidal serovars based on the observed variability in LFQ intensities. Investigation, Chronic carriage of S. typhi can be treated with 4-6 weeks of an antibiotic. The sample mixture was first loaded on a trapping column (made in-house, 100 μm internal diameter (I.D.

We now know that these are all part of one species. Statistical significant differences in LFQ intensities were assessed using a two-sided t-test with Bonferroni adjusted P values using R. Proteins were considered differentially expressed if they showed a minimal 2-fold change in their overall levels with an adjusted P-value lower than 0.05. We thank Tessa De Block for the technical assistance in the study. It is plausible that a serovar-specific effect acts at the sRNA-level, which is not detected in our proteomic analysis. [8] Multidrug resistant strains have been present since the late 1970s in Africa and Asia. Colonies were further solubilized into 3 ml of synthetic growth medium and supplemented with 1% glucose (Teknova HI-DEF Azure Media) until the OD was 0.06, and 250 μl of this suspension was inoculated into 5 ml of synthetic medium supplemented with 1% glucose and grown at 37°C with shaking at 220 rpm until mid-log phase (OD 0.5-OD 0.6). The remaining strains were obtained from patients presenting at the travel clinic at ITM, ethical approval was granted by the Institutional Review Board of ITM. https://doi.org/10.1371/journal.pntd.0007416.g004.


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