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The serious illness of typhoid fever disproportionately affects children in resource-poor settings of sub-Saharan Africa, South and Southeast Asia, and the Western Pacific region. Across the world, the prevalence of Salmonella Typhi strains with resistance to antimicrobial agents is continuously increasing. Two typhoid conjugate vaccines (TCVs), prequalified by the World Health Organization for use in preventing typhoid fever, are safe, effective, and cost-effective for children starting at six months of age. In preventing drug-resistant Salmonella Typhi infections, typhoid conjugate vaccines have demonstrated effectiveness, successfully used in outbreak control and routine immunizations. To effectively counter typhoid fever's spread and severe ramifications, a comprehensive and just distribution of TCVs is critical. The introduction of TCVs and embracing this critical preventative measure by leaders is crucial for empowering decision-makers in typhoid-endemic countries to halt typhoid fever, curb the spread of drug-resistant S. Typhi, advance health equity, and save lives.

Gavi extends its support to countries in the introduction of typhoid conjugate vaccine (TCV), making use of catch-up immunization campaigns. The availability of TCVs, characterized by high efficacy and an equity focus, is essential in controlling the expansion of antimicrobial resistance. Four Gavi-funded nations have put TCVs into use since the year 2018. Following the COVID-19 health crisis, there is a growing initiative to broaden the implementation of TCV internationally, supported by global partnerships and Gavi's financial backing for better typhoid diagnosis tools.

Effective and safe typhoid conjugate vaccines (TCVs) are available, however, many nations do not possess the fine-grained data vital to prioritizing TCV rollout in the communities most at risk. We investigate seroepidemiology, a strategy employing antibody responses to assess the scope of infections, as a viable approach to compensate for this data deficiency. Although serologic tests for typhoid have been in existence for more than a hundred years, the discovery of antigens precise and responsive enough for epidemiologic markers has only happened recently. Seroincidence—the rate of new infections in a population—can be estimated from cross-sectional serosurveys, leveraging these antigens and novel methodological approaches. Enteric fever seroepidemiology gains new avenues of exploration with these instruments, encompassing the production of high-resolution surveillance datasets, the evaluation of vaccination programs' impact, and the incorporation of supplementary serosurveillance endeavors. Continued hurdles exist, encompassing the separation of Salmonella Typhi from Salmonella Paratyphi infections and accounting for instances of reinfection. Seroepidemiology of enteric fever is considerably less expensive, faster, and requires a smaller sample volume than blood culture surveillance, potentially offering a more effective and adaptable approach to tracking this critical infectious disease.

National introductions of licensed and World Health Organization (WHO)-prequalified typhoid conjugate vaccines now show steady progression through a robust pipeline. Typhoid fever's contribution to the total global Salmonella disease burden is less than half, and even less so in the cases of children under five years of age. Invasive nontyphoidal Salmonella disease is the prevailing clinical manifestation of Salmonella in Africa, while paratyphoid A accounts for more than a quarter of enteric fever cases in Asia. In Africa, a three-component typhoid/nontyphoidal Salmonella vaccine is a desirable choice, complemented by a bivalent enteric fever vaccine for Asia. A comprehensive quadrivalent vaccine encompassing the four primary Salmonella enterica serovars responsible for disease, however, could provide a unified solution for global Salmonella prevention.

Water and sanitation improvements have consistently played a historical role in the mitigation of typhoid. In the present day, characterized by escalating antimicrobial resistance (AMR), two WHO-prequalified vaccines are available to accelerate short-term control. Sustained efforts to prevent typhoid in low- and middle-income countries might include longer-term implementation of water and sanitation programs. The historical context of typhoid control is first introduced, then the role of vaccination in complementing water and sanitation activities is presented, concluding with a discussion of the challenges and prospects in achieving effective typhoid infection control. Data gaps and blind spots regarding typhoid are also addressed to prioritize control efforts and progress towards its ultimate eradication. This article distills the insights gained from the December 2021 roundtable discussions at the 12th International Conference on Typhoid and Other Invasive Salmonelloses.

A neglected tropical disease, Salmonella enterica serovar Paratyphi A, the etiological agent of paratyphoid fever, imposes a significant mortality and morbidity burden in low- and middle-income countries. A dearth of information exists concerning the genomic diversity of this organism, particularly within South Asian nations, which are collectively implicated in more than 80% of all paratyphoid cases. At the 2021 International Conference on Typhoid and Other Salmonelloses, researchers from all corners of the world presented their research, focusing on the Salmonella Paratyphi A genome. Recent genomic data from South Asia and the development of the open-access Paratype genotyping scheme were detailed in presentations, specifically focused on systematically and sustainably segregating Salmonella Paratyphi A genomes using single-nucleotide polymorphisms. Here, we offer a summary of Salmonella Paratyphi A genomic research and explore the open questions demanding clarification to deepen our understanding of this pathogen and generate effective interventions.

Nontyphoidal Salmonella bacteria frequently lead to community-acquired bacteremia and other serious infections within sub-Saharan African nations, despite extensive studies indicating a comparatively low incidence in moderate to severe diarrhea cases. According to estimates for 2017, approximately 535,000 instances of non-typhoidal Salmonella invasive illness and 77,500 related deaths were predicted; a considerable portion, specifically 422,000 illnesses and 66,500 deaths, were situated in countries of sub-Saharan Africa. iwp-2 inhibitor Invasive disease cases are frequently attributed to lineages of Salmonella enterica serovar Typhimurium, sequence type 313, and lineages of Salmonella enterica serovar Enteritidis, ST11. No substantial reservoir for these specific strains has been found outside of human hosts. The common occurrence of human fecal shedding of such strains of Salmonella is strongly linked to regions with high incidence of nontyphoidal Salmonella invasive disease. For individuals diagnosed with invasive nontyphoidal Salmonella disease, the fatality rate stands at roughly 15%. To forestall a fatal result, early diagnosis and treatment must be prioritized. The expanding problem of antimicrobial resistance, specifically multiple drug resistance, diminished fluoroquinolone susceptibility, and resistance to third-generation cephalosporins, is predicted to further harm the outcomes of patient care. Within endemic areas, natural immunity against invasive illnesses typically manifests in children exceeding the age of three, likely involving the ordered acquisition of T-cell immunity, followed by the creation of antigen-specific immunoglobulin G antibodies. Preclinical and clinical vaccine development includes live-attenuated strains of Salmonella enterica serovar Typhimurium, non-typhoidal Salmonella enterica core and O-polysaccharide glycoconjugates, multiple antigen-presenting systems, and general modules for membrane antigen vaccines. Phase I trials in Europe and Africa now include the latter. Preventing and controlling nontyphoidal Salmonella invasive disease requires both the use of vaccines and other proven, evidence-based non-vaccine strategies.

A public health concern of major proportion, typhoid fever and other invasive salmonellosis largely affects low- and middle-income nations in Asia and Africa, its spread significantly facilitated by contaminated food or water. However, recent breakthroughs in research, policy, and execution offer a renewed feeling of hope for the prevention and management of the problem. More than ever, a coordinated and multi-sectoral international response is essential. The Coalition against Typhoid, situated within the Sabin Vaccine Institute, orchestrated the 12th International Conference on Typhoid and Other Invasive Salmonelloses, held virtually from December 7th to 9th, 2021, to strategize for the difficulties that lie ahead. The conference's key discoveries are summarized in this commentary, which also underscores the impediments and advantages for prevention and control efforts. Diagnostics advancements, improved data methodologies for better disease burden understanding, environmental surveillance and genomics, the threat of drug resistance, typhoid conjugate vaccines, and integrated solutions are some of the covered topics.

In the context of typhoid fever, typhoid intestinal perforation (TIP) remains the most severe outcome. The diagnosis of TIP in many nations often depends on the identification of the condition during surgery, as the capabilities of blood culture and pathology are limited. Consequently, a substantial number of TIP instances might go unreported as typhoid fever. Sites within Burkina Faso, the Democratic Republic of Congo (DRC), Ethiopia, Ghana, Madagascar, and Nigeria are examined in this study to demonstrate the impact and burden of TIP.
Patients suspected of having a nontraumatic intestinal perforation were enrolled, and their demographics, clinical presentations, surgical procedures, blood cultures, tissue samples, and peritoneal fluid were documented. Utilizing surgical descriptions and cultures as criteria, participants were classified as either having confirmed TIP, probable TIP, possible TIP, or clinical intestinal perforation.
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