scholarly journals Attenuated Salmonella enterica Serovar Typhimurium, Strain NC983, Is Immunogenic, and Protective against Virulent Typhimurium Challenges in Mice

Vaccines ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 646
Author(s):  
Bryan Troxell ◽  
Mary Mendoza ◽  
Rizwana Ali ◽  
Matthew Koci ◽  
Hosni Hassan
Keyword(s):  
Vaccine Strain ◽  
Oral Delivery ◽  
Salmonella Enterica Serovar Typhimurium ◽  
Live Attenuated Vaccine ◽  
Typhimurium Strain ◽  
Health Burden ◽  
Serovar Typhimurium ◽  
Murine Liver ◽  
Further Development ◽  
Significant Health

Non-typhoidal Salmonella (NTS) serovars are significant health burden worldwide. Although much effort has been devoted to developing typhoid-based vaccines for humans, currently there is no NTS vaccine available. Presented here is the efficacy of a live attenuated serovar Typhimurium strain (NC983). Oral delivery of strain NC983 was capable of fully protecting C57BL/6 and BALB/c mice against challenge with virulent Typhimurium. Strain NC983 was found to elicit an anti-Typhimurium IgG response following administration of vaccine and boosting doses. Furthermore, in competition experiments with virulent S. Typhimurium (ATCC 14028), NC983 was highly defective in colonization of the murine liver and spleen. Collectively, these results indicate that strain NC983 is a potential live attenuated vaccine strain that warrants further development.

scholarly journals Characterization of a Laboratory-Derived, High-Level Ampicillin-Resistant Salmonella enterica Serovar Typhimurium Strain That Caused Meningitis in an Infant

2002 ◽  
Vol 46 (5) ◽  
pp. 1604-1606 ◽  
Author(s):  
Cheng-Hsun Chiu ◽  
Chishih Chu ◽  
Lin-Hui Su ◽  
Wan-Yu Wu ◽  
Tsu-Lan Wu
Keyword(s):  
Cerebrospinal Fluid ◽  
Salmonella Enterica ◽  
Salmonella Enterica Serovar Typhimurium ◽  
Cloning Vector ◽  
Typhimurium Strain ◽  
Serovar Typhimurium ◽  
High Level ◽  
Lactamase Gene

ABSTRACT A Salmonella enterica serovar Typhimurium strain that harbored a plasmid carrying a TEM-1-type β-lactamase gene was isolated from the blood and cerebrospinal fluid of an infant with meningitis. This 3.2-kb plasmid was further characterized to be a nonconjugative pGEM series cloning vector containing a foreign insert. The strain was likely laboratory derived and contaminated the environment before it caused the infection.

scholarly journals Complete Genome Sequence of Salmonella enterica Serovar Typhimurium Siphophage Siskin

2019 ◽  
Vol 8 (18) ◽  
Author(s):  
Chandler O’Leary ◽  
Yicheng Xie ◽  
Rohit Kongari ◽  
Jason J. Gill ◽  
Mei Liu
Keyword(s):  
Genome Sequence ◽  
Complete Genome Sequence ◽  
Salmonella Enterica ◽  
Complete Genome ◽  
Salmonella Enterica Serovar Typhimurium ◽  
Content Type ◽  
New Class ◽  
Typhimurium Strain ◽  
Serovar Typhimurium ◽  
Lysis Cassette

Bacteriophage Siskin is a member of the χ-like siphovirus phage cluster that infects Salmonella enterica serovar Typhimurium strain LT2. Here, we report the complete 58,476-bp sequence of the Siskin genome, provide confirmation of its genomic termini, and describe a potentially new class of holins and endolysins found in the lysis cassette.

scholarly journals A DIVA vaccine strain lacking RpoS and the secondary messenger c-di-GMP for protection against salmonellosis in pigs

2020 ◽  
Vol 51 (1) ◽  
Author(s):  
Carmen Gil ◽  
Cristina Latasa ◽  
Enrique García-Ona ◽  
Isidro Lázaro ◽  
Javier Labairu ◽  
...  
Keyword(s):  
Vaccine Strain ◽  
Serological Test ◽  
Oral Route ◽  
Infection Model ◽  
Cell Mediated Immunity ◽  
Protective Effects ◽  
The European Union ◽  
Live Attenuated Vaccine ◽  
Secondary Messenger ◽  
Serovar Typhimurium

AbstractSalmonellosis is the second most common food-borne zoonosis in the European Union, with pigs being a major reservoir of this pathogen. Salmonella control in pig production requires multiple measures amongst which vaccination may be used to reduce subclinical carriage and shedding of prevalent serovars, such as Salmonella enterica serovar Typhimurium. Live attenuated vaccine strains offer advantages in terms of enhancing cell mediated immunity and allowing inoculation by the oral route. However, main failures of these vaccines are the limited cross-protection achieved against heterologous serovars and interference with serological monitoring for infection. We have recently shown that an attenuated S. Enteritidis strain (ΔXIII) is protective against S. Typhimurium in a murine infection model. ΔXIII strain harbours 13 chromosomal deletions that make it unable to produce the sigma factor RpoS and synthesize cyclic-di-GMP (c-di-GMP). In this study, our objectives were to test the protective effects of ΔXIII strain in swine and to investigate if the use of ΔXIII permits the discrimination of vaccinated from infected pigs. Results show that oral vaccination of pre-weaned piglets with ΔXIII cross-protected against a challenge with S. Typhimurium by reducing faecal shedding and ileocaecal lymph nodes colonization, both at the time of weaning and slaughter. Vaccinated pigs showed neither faecal shedding nor tissue persistence of the vaccine strain at weaning, ensuring the absence of ΔXIII strain by the time of slaughter. Moreover, lack of the SEN4316 protein in ΔXIII strain allowed the development of a serological test that enabled the differentiation of infected from vaccinated animals (DIVA).

scholarly journals Complete Genome Sequence of Salmonella enterica Serovar Typhimurium Siphophage Skate

2019 ◽  
Vol 8 (27) ◽  
Author(s):  
Matthew Rohren ◽  
Yicheng Xie ◽  
Chandler O’Leary ◽  
Rohit Kongari ◽  
Jason Gill ◽  
...  
Keyword(s):  
Genome Sequence ◽  
Complete Genome Sequence ◽  
Salmonella Enterica ◽  
Complete Genome ◽  
Salmonella Enterica Serovar Typhimurium ◽  
Foodborne Illnesses ◽  
Gram Negative ◽  
Content Type ◽  
Typhimurium Strain ◽  
Serovar Typhimurium

ABSTRACT Salmonella enterica serovar Typhimurium is a Gram-negative pathogen and a primary cause of foodborne illnesses worldwide. Here, we present the complete 47,393-bp genome sequence of the siphophage Skate, which was isolated against S. Typhimurium strain LT2.

scholarly journals The enzyme phosphoglucomutase (Pgm) is required by Salmonella enterica serovar Typhimurium for O-antigen production, resistance to antimicrobial peptides and in vivo fitness

Microbiology ◽  
2009 ◽  
Vol 155 (10) ◽  
pp. 3403-3410 ◽  
Author(s):  
G. K. Paterson ◽  
D. B. Cone ◽  
S. E. Peters ◽  
D. J. Maskell
Keyword(s):  
Antimicrobial Peptides ◽  
Salmonella Enterica ◽  
Salmonella Enterica Serovar Typhimurium ◽  
Live Attenuated Vaccine ◽  
Antigen Production ◽  
O Antigen ◽  
Serovar Typhimurium

The enzyme phosphoglucomutase (Pgm) catalyses the interconversion of glucose 1-phosphate and glucose 6-phosphate and contributes to glycolysis and the generation of sugar nucleotides for biosynthesis. To assess the role of this enzyme in the biology of the pathogen Salmonella enterica serovar Typhimurium we have characterized a pgm deletion mutant in strain SL1344. Compared to SL1344, SL1344 pgm had impaired growth in vitro, was deficient in the ability to utilize galactose as a carbon source and displayed reduced O-antigen polymer length. The mutant was also more susceptible to antimicrobial peptides and showed decreased fitness in the mouse typhoid model. The in vivo phenotype of SL1344 pgm indicated a role for pgm in the early stages of infection, most likely through deficient O-antigen production. Although pgm mutants in other pathogens have potential as live attenuated vaccine strains, SL1344 pgm was not sufficiently attenuated for such use.

scholarly journals Complete Genome Sequence of Salmonella enterica Serovar Typhimurium Strain SO3 (Sequence Type 302) Isolated from a Baby with Meningitis in Mexico

2016 ◽  
Vol 4 (2) ◽  
Author(s):  
Pablo Vinuesa ◽  
José L. Puente ◽  
Edmundo Calva ◽  
Mussaret B. Zaidi ◽  
Claudia Silva
Keyword(s):  
Genome Sequence ◽  
Complete Genome Sequence ◽  
Salmonella Enterica ◽  
Complete Genome ◽  
Salmonella Enterica Serovar Typhimurium ◽  
Sequence Type ◽  
Genomic Islands ◽  
Virulence Plasmid ◽  
Typhimurium Strain ◽  
Serovar Typhimurium

The complete genome of Salmonella enterica serovar Typhimurium strain SO3 (sequence type 302), isolated from a fatal meningitis infection in Mexico, was determined using PacBio technology. The chromosome hosts six complete prophages and is predicted to harbor 51 genomic islands, including 13 pathogenicity islands (SPIs). It carries the Salmonella virulence plasmid (pSTV).

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