scholarly journals A Review on Recent Developments for the Cure of Salmonella Enterica Serovar Typhi, the Causative Agent for Typhoid Fever

2020 ◽  
Vol 1 (2) ◽  
pp. 1-8
Author(s):  
Muqadas Kanwal ◽  
Fadia Waheed ◽  
Hafsa Shahzadi ◽  
Muhammad Shahbaz ◽  
Ahsan Noor
Keyword(s):  
Typhoid Fever ◽  
Salmonella Enterica ◽  
Enteric Fever ◽  
Ethical Issues ◽  
Age Groups ◽  
Human Infection ◽  
Health Concern ◽  
Typhoid Vaccine ◽  
The World

Salmonella enterica typhi is typhoid or enteric fever agent which is a serious water-borne disease and is a human host restricted organism. So, an important cause of death in underdeveloped countries, typhoid fever is a public health concern. Worldwide, 15-30 million people suffer from this disease every year, causing more than 200,000 deaths. However, several lines of evidence suggest that the advent of multidrug-resistant non-typhoidal strains of Salmonella has an important impact on the effectiveness of current strategies, including reductions in the effectiveness of early empirical treatment for controlling and managing foodborne diseases. Recent studies show more than 2000 strains of salmonella bacteria with around 100 strains connected to human infection - with myriad common strains from Salmonella Heidelberg to Typhimurium to Salmonella infantis. The multi-medicinal strain S. Typhi H58 has developed into the main circulating strain in many parts of the world, and an extensively drug-resistant (XDR) subclade has been recently found. Most of the people agree that the most effective way to control infection is to vaccinate susceptible populations. The commercially available live attenuated (Ty21a) vaccine, on the other hand, is not recommendable for children under the age of six, whereas the poor long-term efficacy of Vi-polysaccharide-based vaccine against typhoid fever. Furthermore, there are no vaccines available to protect against S. para typhi infection. Subsequently, a new formulation is urgently needed that can provide long-term protection against both pathogens while healthy for all age groups. Pakistan is the first country in the world to incorporate the WHO-recommended conjugate vaccine into its routine typhoid immunization program (2019). As a result, the purpose of this review is to describe the various diagnostic procedures for typhoid fever diagnosis and cure development. This article addressed some of the elements and components required for the implementation of typhoid vaccine. With an analysis of past and current enteric fever vaccines in progress as well as the ethical issues relevant to CHIM in typhoid vaccine efficacy research, we have combined the new methods to predict typhoid burden and vaccines impact.

The potential role of stress and sex steroids in heritable effects of sevoflurane

2021 ◽  
Author(s):  
Anatoly E Martynyuk ◽  
Ling-Sha Ju ◽  
Timothy E Morey
Keyword(s):  
Sex Steroids ◽  
Age Groups ◽  
Postnatal Period ◽  
Health Concern ◽  
General Anesthetics ◽  
Pharmacological Agents ◽  
Experimental Findings ◽  
Heritable Effects

Abstract Most surgical procedures require general anesthesia, which is a reversible deep sedation state lacking all perception. The induction of this state is possible because of complex molecular and neuronal network actions of general anesthetics (GAs) and other pharmacological agents. Laboratory and clinical studies indicate that the effects of GAs may not be completely reversible upon anesthesia withdrawal. The long-term neurocognitive effects of GAs, especially when administered at the extremes of ages, are an increasingly recognized health concern and the subject of extensive laboratory and clinical research. Initial studies in rodents suggest that the adverse effects of GAs, whose actions involve enhancement of GABA type A receptor activity (GABAergic GAs), can also extend to future unexposed offspring. Importantly, experimental findings show that GABAergic GAs may induce heritable effects when administered from the early postnatal period to at least young adulthood, covering nearly all age groups that may have children after exposure to anesthesia. More studies are needed to understand when and how the clinical use of GAs in a large and growing population of patients can result in lower resilience to diseases in the even larger population of their unexposed offspring. This minireview is focused on the authors’ published results and data in the literature supporting the notion that GABAergic GAs, in particular sevoflurane, may upregulate systemic levels of stress and sex steroids and alter expressions of genes that are essential for the functioning of these steroid systems. The authors hypothesize that stress and sex steroids are involved in the mediation of sex-specific heritable effects of sevoflurane.

scholarly journals Highly Resistant Salmonella enterica Serovar Typhi with a NovelgyrAMutation Raises Questions about the Long-Term Efficacy of Older Fluoroquinolones for Treating Typhoid Fever

2012 ◽  
Vol 56 (5) ◽  
pp. 2761-2762 ◽  
Author(s):  
Kanika Deshpande Koirala ◽  
Duy Pham Thanh ◽  
Sudeep Dhoj Thapa ◽  
Amit Arjyal ◽  
Abhilasha Karkey ◽  
...  
Keyword(s):  
Multidrug Resistance ◽  
Typhoid Fever ◽  
Treatment Failure ◽  
Salmonella Enterica ◽  
Systemic Infection ◽  
Resistant Isolate ◽  
Content Type ◽  
Salmonella Enterica Serovar Typhi ◽  
Term Efficacy

ABSTRACTAs a consequence of multidrug resistance, clinicians are highly dependent on fluoroquinolones for treating the serious systemic infection typhoid fever. While reduced susceptibility to fluoroquinolones, which lessens clinical efficacy, is becoming ubiquitous, comprehensive resistance is exceptional. Here we report ofloxacin treatment failure in typhoidal patient infected with a novel, highly fluoroquinolone-resistant isolate ofSalmonella entericaserovar Typhi. The isolation of this organism has serious implications for the long-term efficacy of ciprofloxacin and ofloxacin for typhoid treatment.

scholarly journals The Effects of Air Pollution on COVID-19 Infection and Mortality—A Review on Recent Evidence

2020 ◽  
Vol 8 ◽  
Author(s):  
Nurshad Ali ◽  
Farjana Islam
Keyword(s):  
Public Health ◽  
Air Pollution ◽  
Nitrogen Dioxide ◽  
Air Pollutants ◽  
Health Concern ◽  
Public Health Concern ◽  
Short Term ◽  
The World ◽  
Harmful Effects

The outbreak of COVID-19 has created a serious public health concern worldwide. Although, most of the regions around the globe have been affected by COVID-19 infections; some regions are more badly affected in terms of infections and fatality rates than others. The exact reasons for such variations are not clear yet. This review discussed the possible effects of air pollution on COVID-19 infections and mortality based on some recent evidence. The findings of most studies reviewed here demonstrate that both short-term and long-term exposure to air pollution especially PM2.5 and nitrogen dioxide (NO2) may contribute significantly to higher rates of COVID-19 infections and mortalities with a lesser extent also PM10. A significant correlation has been found between air pollution and COVID-19 infections and mortality in some countries in the world. The available data also indicate that exposure to air pollution may influence COVID-19 transmission. Moreover, exposure to air pollution may increase vulnerability and have harmful effects on the prognosis of patients affected by COVID-19 infections. Further research should be conducted considering some potential confounders such as age and pre-existing medical conditions along with exposure to NO2, PM2.5 and other air pollutants to confirm their detrimental effects on mortalities from COVID-19.

scholarly journals The Covid-19 Pandemic and its Effect on the Elderly: A Review

2020 ◽  
Vol 5 (3) ◽  
Author(s):  
Maimoona Nadri ◽  
Ujala Zubair
Keyword(s):  
The Elderly ◽  
Medical Community ◽  
Health Concern ◽  
The Novel ◽  
Global Public Health ◽  
Public Health Concern ◽  
The World ◽  
Long Term Consequences ◽  
Novel Coronavirus

In 2019, the world experienced a global public health concern when the novel coronavirus originated from China and affected around fifty-seven thousand people around the world by March 2020. The quick rise in the number of cases and the death toll overwhelmed the scientific and medical community. While all the focus was driven towards finding the epidemiology, the treatment and the management, the mental health aspect of the quarantine was being overlooked. The purpose of this review is to create awareness about the long-term consequences of quarantine, with the focus on the elderly community in Pakistan. 

scholarly journals In a War with the Virus: Science, People and Politics

2021 ◽  
pp. 130-148
Author(s):  
Deepak Gupta
Keyword(s):  
Political Communication ◽  
Age Groups ◽  
Two Dimensions ◽  
Marketing Strategies ◽  
Health Concern ◽  
Key Informant ◽  
The World ◽  
Repurposed Drugs ◽  
High Level ◽  
Key Informant Interview

The world, attacked by a malicious virus in the last quarter of the year 2019 termed it as SARS-CoV-2 (WHO) and manifestation of the ‘disease’ caused due to this virus was dubbed as COVID-19. Transmitting through respiratory-tract, it has already impacted millions of people, with a high mortality in vulnerable age groups.  It is reckoned that the outbreak of COVID-19 pandemic is a major public health concern with equally dire health consequences with critical environmental and economic impacts. Scientific community developed multiple vaccines and repurposed drugs for the COVID-19; however, the vaccination against this pathogen still throws a huge challenge of low uptake across the world. There are two dimensions to COVID-19 vaccination programme, i.e. ensuring equitable access and the positive behaviour change marketing strategies.  People acknowledge that this pandemic is primarily a ‘behavioural practices’ issue, including at community levels. The outrage of the ‘infodemic’ (spread of misinformation) is gaining currency especially through social media and digital space. The technical area of health communication has assumed a high-level of tilted ‘political communication’ in many countries. It is, therefore, time to witness more of science in politics than politics in science.  The article includes a key informant interview with a former WHO expert.

scholarly journals The Salmonella enterica Serovar Typhi Type IVB Self-Association Pili Are Detached from the Bacterial Cell by the PilV Minor Pilus Proteins

2006 ◽  
Vol 74 (9) ◽  
pp. 5414-5418 ◽  
Author(s):  
Connie K. P. Tam ◽  
Christina Morris ◽  
Jim Hackett
Keyword(s):  
Typhoid Fever ◽  
Bacterial Cell ◽  
Salmonella Enterica ◽  
Enteric Fever ◽  
Dna Supercoiling ◽  
Bacterial Membrane ◽  
Salmonella Enterica Serovar Typhi ◽  
Protein Molecules ◽  
Dna Fragment ◽  
Self Association

ABSTRACT Salmonella enterica serovar Typhi and some strains (Vi+) of serovar Dublin use type IVB pili to facilitate bacterial self-association, but only when the PilV proteins (potential minor pilus proteins) are not synthesized. Pilus-mediated self-association may be important in the pathogenesis of enteric fever. We have shown previously that the extent of DNA supercoiling controls the rate of Rci-catalyzed inversion of a DNA fragment which includes the C-terminal portions of the PilV proteins. This inversion therefore controls PilV synthesis as a high inversion rate prohibits transcription of pilV-encoding DNA. Here, we describe the manner in which PilV protein expression inhibits bacterial self-association and present data which suggest that incorporation of one or a few PilV protein molecules into a growing pilus, comprised of PilS subunits, causes the pilus to detach at the bacterial membrane. The bacteria are then unable to self-associate. We suggest that this phenomenon may be relevant to the pathogenesis of typhoid fever.

scholarly journals Ciprofloxacin treatment failure in a case of typhoid fever caused by Salmonella enterica serotype Paratyphi A with reduced susceptibility to ciprofloxacin

2007 ◽  
Vol 56 (2) ◽  
pp. 277-279 ◽  
Author(s):  
Tzonyo Dimitrov ◽  
Edet E. Udo ◽  
Osama Albaksami ◽  
Abdul A. Kilani ◽  
El-Din M. R. Shehab
Keyword(s):  
Typhoid Fever ◽  
Treatment Failure ◽  
Salmonella Enterica ◽  
Enteric Fever ◽  
Susceptibility Testing ◽  
Laboratory Methods ◽  
New Guidelines ◽  
Oral Ciprofloxacin

This report describes a case of ciprofloxacin treatment failure in a patient with enteric fever caused by Salmonella enterica serotype Paratyphi A. The organism was isolated from a blood culture from a patient who was treated with oral ciprofloxacin (500 mg every 12 h) for 13 days. The organism showed reduced susceptibility to ciprofloxacin (MIC 0.75 μg ml−1) and was resistant to nalidixic acid. The patient was then placed on intravenous ceftriaxone (1 g every 12 h) and responded within 3 days. The patient was discharged after 9 days on ceftriaxone with no relapse on follow-up. This case adds to the increasing incidence of treatment failures with ciprofloxacin in typhoid fever caused by typhoid salmonellae with reduced susceptibility to ciprofloxacin. It also highlights the inadequacy of current laboratory methods for fluoroquinolone susceptibility testing in adequately predicting in vivo activity of ciprofloxacin against typhoid salmonellae and supports calls for new guidelines for fluoroquinolone susceptibility testing of these organisms.

scholarly journals Aging Society and Decline Fertility: How to Respond?

2012 ◽  
Vol 6 (3) ◽  
pp. 333-341
Author(s):  
Asim Kurjak ◽  
Ana Stavljenic Rukavina
Keyword(s):  
Obstet Gynecol ◽  
Age Groups ◽  
Social Consequences ◽  
Aging Society ◽  
Younger Age ◽  
The World ◽  
Almost All ◽  
Aging World ◽  
The Relationship

ABSTRACT We are living in the time of aging of almost all societies in the world. There are at least two long-term causes of aging world and a temporary blip that will continue to show up in the figures for the next few decades. The first of the big reasons is that people everywhere are living far longer than they used to. A second and bigger cause of the aging of societies is that people everywhere are having far fewer children, so the younger age groups are much too small to counterbalance the growing number of older people. These facts will certainly turn the world into a different place. In this paper, we would like to stress the relationship between economic growth, aging and decline fertility as well as social consequences of both. How to cite this article Kurjak A, Stavljenic Rukavina A, Stanojevic M. Aging Society and Decline Fertility: How to Respond? Donald School J Ultrasound Obstet Gynecol 2012;6(3):333-341.

scholarly journals Salmonella enterica Serovar Paratyphi C Carries an Inactive Shufflon

2004 ◽  
Vol 72 (1) ◽  
pp. 22-28 ◽  
Author(s):  
Connie K. P. Tam ◽  
Jim Hackett ◽  
Christina Morris
Keyword(s):  
Typhoid Fever ◽  
Base Pair ◽  
Salmonella Enterica ◽  
Enteric Fever ◽  
Terminal Region ◽  
Inverted Repeats ◽  
Single Base ◽  
Single Base Pair ◽  
Self Association ◽  
Base Pair Insertion

ABSTRACT Salmonella enterica serovar Typhi uses type IVB pili to facilitate bacterial self-association, but only when the PilV proteins (potential minor pilus proteins) are not synthesized. This pilus-mediated event may be important in typhoid fever pathogenesis. We initially show that S. enterica serovar Paratyphi C strains harbor a pil operon very similar to that of serovar Typhi. An important difference, however, is located in the shufflon which concludes the pil operon. In serovar Typhi, the Rci recombinase acts upon two 19-bp inverted repeats to invert the terminal region of the pilV gene, thereby disrupting PilV synthesis and permitting bacterial self-association. In serovar Paratyphi C, however, the shufflon is essentially inactive because each of the Rci 19-bp substrates has acquired a single base pair insertion. A PilV protein is thus synthesized whenever the pil operon is active, and bacterial self-association therefore does not occur in serovar Paratyphi C. The data thus suggest that serovar Typhi bacterial self-association using type IVB pili may be important in the pathogenesis of epidemic enteric fever.

scholarly journals Salmonella enterica Serovar Typhi Ty21a Expressing Human Papillomavirus Type 16 L1 as a Potential Live Vaccine against Cervical Cancer and Typhoid Fever

2007 ◽  
Vol 14 (10) ◽  
pp. 1285-1295 ◽  
Author(s):  
Dominique Fraillery ◽  
David Baud ◽  
Susana Yuk-Ying Pang ◽  
John Schiller ◽  
Martine Bobst ◽  
...  
Keyword(s):  
Cervical Cancer ◽  
Human Papillomavirus ◽  
Typhoid Fever ◽  
Salmonella Enterica ◽  
Neutralizing Antibodies ◽  
Neutralizing Antibody ◽  
Oral Immunization ◽  
Typhoid Vaccine ◽  
Serovar Typhimurium ◽  
Cervical Cancer Vaccine

ABSTRACT Human papillomavirus (HPV) vaccines based on L1 virus-like particles (VLPs) can prevent HPV-induced genital neoplasias, the precursors of cervical cancer. However, most cervical cancers occur in developing countries, where the implementation of expensive vaccines requiring multiple injections will be difficult. A live Salmonella-based vaccine could be a lower-cost alternative. We previously demonstrated that high HPV type 16 (HPV16)-neutralizing titers are induced after a single oral immunization of mice with attenuated Salmonella enterica serovar Typhimurium strains expressing a codon-optimized version of HPV16 L1 (L1S). To allow the testing of this type of vaccine in women, we constructed a new L1-expressing plasmid, kanL1S, and tested kanL1S recombinants of three Salmonella enterica serovar Typhi vaccine strains shown to be safe in humans, i.e., Ty21a, the actual licensed typhoid vaccine, and two highly immunogenic typhoid vaccine candidates, Ty800 and CVD908-htrA. In an intranasal mouse model of Salmonella serovar Typhi infection, Ty21a kanL1S was unique in inducing HPV16-neutralizing antibodies in serum and genital secretions, while anti-Salmonella responses were similar to those against the parental Ty21a vaccine. Electron microscopy examination of Ty21a kanL1S lysates showed that L1 assembled in capsomers and capsomer aggregates but not well-ordered VLPs. Comparison to the neutralizing antibody response induced by purified HPV16 L1 VLP immunizations in mice suggests that Ty21a kanL1S may be an effective prophylactic HPV vaccine. Ty21a has been widely used against typhoid fever in humans with a remarkable safety record. These finds encourage clinical testing of Ty21a kanL1S as a combined typhoid fever/cervical cancer vaccine with the potential for worldwide application.

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