Articles tagged with Virulence
Researchers have compiled ten fundamental mechanisms governing the development of pandemics, highlighting the importance of understanding biological, mathematical, and social factors. These mechanisms can help improve preparedness and response to future pandemics by identifying key drivers of outbreak dynamics.
A new review proposes a paradigm-shifting framework to address the growing threat of Carbapenem-resistant hypervirulent Klebsiella pneumoniae (CR-hvKP). The framework highlights the importance of considering virulence phenotype over co-detection of resistance genes and virulence markers.
A clinical case study demonstrates that heterovirulence, a simultaneous presence of subpopulations with different levels of virulence, can lead to the emergence of increasingly virulent subpopulations. This process can occur in seemingly harmless reservoirs, such as urinary tract infections, and contribute to the spread of infection wi...
A new study reveals that ancient bacterial genomes from teeth of human remains found at four hunter-gatherer cemeteries in East Siberia reconstructed the earliest forms of plague. The findings suggest that these early strains were highly lethal and carried a unique superantigen, increasing the severity of infection.
Research led by University of Utah biologists shows that host genetics and sex influence how influenza viruses evolve. Female mice from a specific strain exhibit accelerated virulence gains compared to male mice.
A research team at the University of Basel has uncovered how a key protein switches on the machinery that enables Leptospira pathogens to survive and cause disease. By understanding this process, scientists may design drugs that keep the pathogen from becoming virulent, preventing severe cases and reducing mortality.
Researchers genetically modified a probiotic yeast to reduce its virulence in immunocompromised patients. The modified yeast was found to be less likely to cause infection, with improved survival rates in animal models.
A new index maps state-level flu risk, highlighting regional disparities and socioeconomic factors contributing to vulnerability. Policymakers can use this tool to develop targeted strategies, strengthen epidemic preparedness, and address disparities in flu risk across the US.
The inaugural article in Microbiology Outlooks connects within-host genomics and evolutionary theory, reframing virulence as a context-dependent strategy. The research has implications for vaccine design, antimicrobial stewardship, and epidemic control strategies.
A new study provides a long-sought structural explanation for how Vibrio cholerae colonizes the human gut and produces the cholera toxin. The research reveals that ToxR and TcpP stabilize a specific part of the RNA polymerase directly onto DNA, achieving virulence gene activation without reshaping the transcription machinery.
Scientists at Leibniz-HKI discovered an enzyme called BurK that cleaves the toxic molecule malleicyprol in human pathogenic bacteria. This mechanism regulates toxin levels and renders it harmless to humans, offering a potential therapeutic approach for antibiotic-resistant infections.
The FluWarning system uses genetic code analysis to detect subtle changes in flu viruses that may indicate cross-species transmission. It has been successfully applied to H5N1 bird flu and detected clusters of viral activity in the US, issuing alerts before official reports were published.
Researchers at Penn State have identified certain characteristics that can help predict whether a virus will persist in a new population. Infection prevalence and viral shedding were found to be significant predictors of long-term viral persistence. The study used a worm model system to examine disease transmission and emergence at a p...
Scientists have developed a monoclonal antibody to combat life-threatening inflammatory diseases like sepsis and ARDS. The antibody shows promise in blocking the immune system's hyperactive response and restoring healthy function without unwanted side effects.
Researchers mapped the frequencies used by Staphylococcus bacteria to communicate, identifying a signal from another species as potent against MRSA. This alternative technique weakens bacterial ability to coordinate attacks on hosts without killing them.
Researchers from University of Zurich and Basel decode historical specimen to understand how 1918-1920 influenza pandemic evolved in Europe. The Swiss genome reveals three key adaptations that made the virus more resistant to human immunity and more infectious.
Researchers analyzed protein-coding RNA transcripts from single cells and lung fluid of infected pigs, monitoring immune cell alterations triggered by PRRSV strains of varying virulence. They found that high-virulence PRRSV caused severe lung damage and immune imbalance, while less virulent strains led to delayed lung damage with fewer...
Researchers found that rotavirus protein NSP4 is necessary and sufficient for disrupting calcium signaling in infected and uninfected cells, affecting disease severity. Manipulating NSP4 could lead to new approaches to prevent or treat rotavirus infections.
Environmental heterogeneity consistently increases pathogen virulence and infectivity. Modest variations in local conditions can lead to up to 40% higher evolved virulence compared to homogeneous metapopulations.
A new study finds that disease-causing bacteria can infect a wide range of plant species, including non-flowering plants, using a common set of pathogenicity factors. The research suggests that the toxin syringomycin interferes with cell membranes across diverse plant species.
A six-year study examining 38 clinical isolates of Cryptococcus found genes and gene alleles associated with disease severity. The research aims to develop new treatments targeting these genetic variations, predicting disease outcomes and improving patient care.
Researchers found that antibodies targeting a specific site on the malaria parasite's virulence protein bind to the human host's endothelial protein C receptor, neutralizing the parasite. The discovery provides new insights into prevention and treatment of severe malaria.
Researchers identified a protein that inhibits human defense mechanisms and allows fungal growth. The study suggests that the lack of this enzyme makes the fungus more prone to elimination by the immune system.
Researchers at Houston Methodist have identified a new strain of bacteria, Streptococcus dysgalactiae subspecies equisimilis (SDSE), linked to increasingly severe human infections. The study used integrative analysis to investigate the genome, transcriptome, and virulence of SDSE strains, shedding light on their molecular pathogenesis.
Providencia rustigianii carries a type III secretion system and cytolethal distending toxin virulence gene, increasing its pathogenicity, similar to Salmonella.
A nationwide study by Nanyang Technological University found that individuals who recovered from dengue are at a 55% higher risk of long-term health complications, including heart problems and cognitive disorders. This is compared to those who recovered from COVID-19.
A study published in Genome Biology and Evolution found that predation by protists increases the virulence of opportunistic pathogens like Serratia marcescens. The presence of the predator Tetrahymena thermophila led to stronger biofilm formation and greater antimicrobial resistance, resulting in higher mortality in honey bees.
The American Gastroenterological Association recommends fecal microbiota transplant (FMT) as a safe and effective treatment for most patients with recurrent Clostridioides difficile infection. FMT offers hope to patients suffering from debilitating C. diff, enabling them to lead happy and healthy lives.
Researchers at NIAID have successfully created a strain of Coxiella burnetii without the genetic flaw that makes it virulent, enabling safe use in laboratory settings. The new strain, NMII-E, has implications for diagnostic sensitivity and vaccine development.
Research reveals that a small subset of bacterial cells produces deadly toxins while sacrificing themselves for the benefit of their comrades. The bacteria use a temperature-sensitive genetic switch to synchronize toxin production with cell enlargement, ensuring an efficient strategy for infection.
A team of researchers identified a CTP-dependent transcription factor controlling Shigella virulence gene expression, providing new avenues for combating this and related bacterial pathogens. The discovery sheds light on the molecular mechanisms underlying bacterial pathogenesis.
Plant scientists have discovered a sophisticated RNA defense system that plants use to attack gray mold cells, sending mRNA molecules that disrupt fungal cellular processes. This innovative approach could lead to the development of eco-friendly fungicides with minimal environmental impact and no harm to humans or animals.
Researchers found that Porphyromonas gingivalis inhibits autophagosome-lysosome fusion, worsening cardiac remodeling and causing cardiac rupture after myocardial infarction. The study suggests that treating this oral infection could help prevent fatal heart attacks.
A recent VA study analyzed electronic health records of over 5.9 million veterans to provide insights into COVID-19 mortality rates. The research found that absolute numbers of deaths were higher in younger age groups and healthier individuals, despite older adults experiencing the highest rate of excess mortality.
Researchers have discovered a unique adhesin in Candida auris that enables it to stick to surfaces and cause disease. The study found that this adhesin, SCF1, is essential for colonization and virulence, suggesting a potential target for anti-fungal therapy.
Researchers have identified specific genetic elements in a highly virulent Lyme disease strain, suggesting key factors contributing to its infectiousness and human dissemination. The study's findings provide new insights into the spread of this debilitating disease.
Researchers have identified a new trichothecene, NX, produced by Fusarium graminearum, which contributes to the pathogen's ability to infect wheat and spread disease. Deleting the gene responsible for NX production reduces toxin levels and disease severity, providing potential control methods.
A recent study has identified the specific gut bacteria that pose a threat to neonatal babies, particularly those with necrotising enterocolitis. Researchers analyzed genomic similarities in Clostridium perfringens and found a set of strains with lower disease-causing capacity, lacking genes responsible for toxin production.
Researchers have discovered that a previously unknown strategy is used by the foodborne bacterium Listeria monocytogenes to invade and infect humans and animals. A housekeeping enzyme called LAP plays a crucial role in this process, and its attachment to the bacterial surface is essential for pathogenesis.
A study published in The Lancet Regional Health - Western Pacific found that carbapenem-resistant Acinetobacter baumannii (CRAB) contaminated the entire ICU, with samples detected on bed units, ventilators, and equipment. The researchers highlight the urgent need for targeted infection prevention and control measures to stem the global...
A Brazilian study analyzed data from over 40,000 patients admitted to ICUs and found lower mortality rates during the Omicron outbreak compared to previous strains of Covid-19. Vaccination coverage contributed to the lower mortality observed in the Omicron period, but vulnerable patients remain at risk.
Experts recommend managing SARS-CoV-2 like other endemic respiratory viruses using Standard and Transmission-based Precautions. They also suggest reconsidering pandemic-era strategies such as asymptomatic testing and contact tracing in the endemic era.
Experts review changing context for masking in healthcare settings, highlighting advancements in population immunity and medical countermeasures. They advocate for managing SARS-CoV-2 like other respiratory viruses, ensuring healthcare personnel use masks when necessary.
Denmark has seen a significant surge in strep A infections, particularly among the elderly, since late 2022. The new M1 subvariant is responsible for 30% of cases and may be contributing to the outbreak's severity.
A recent study reveals the first high-quality nuclear genome sequence and assembly of Babesia duncani, a neglected species until now. The parasite's evolution and mechanism of virulence have been identified, providing leads for the development of effective therapies.
The study reveals that more than 70% of patients developed urinary tract infections caused by endogenous E. coli strains from their own gut microbiota. The researchers also found that non-lactose-fermenting E. coli strains, less common in other countries, were present in the gut microbiota of some patients.
Scientists have developed a mouse model of mpox virus, revealing differences in virulence among genetic groups. The new model shows that the current outbreak strain, clade IIb, has a significantly lower mortality rate than previous strains.
Researchers found that two proteins help MRSA cells pump toxins into their environment. Targeting these proteins could disable MRSA and reduce its virulence.
The study reveals that repeated mutations in the sarZ gene lead to increased severity of MRSA blood stream infections, and that surface protein ClfB plays a critical role in pathogenesis. The findings provide insights into the factors contributing to MRSA virulence and may help uncover new treatment approaches.
Researchers have characterized the tar spot pathogen on a molecular level, revealing its virulence molecules target specific plant organelles. This study advances our understanding of plant-pathogen interactions and contributes to developing disease control strategies.
A new study by CHOP researchers found that antibiotic-resistant Enterococcus enhances C. difficile virulence by modulating the gut environment, increasing toxin production and nutrient supply. This interaction supports increased colonization and persistence of C. difficile in the gut.
A new study by MIT researchers finds that maintaining an indoor relative humidity between 40 and 60 percent is associated with relatively lower rates of COVID-19 infections and deaths. Indoor conditions outside this range are linked to worse COVID-19 outcomes.
Researchers have found that hypermucoviscous K pneumoniae strains carry higher rates of virulence genes and are less responsive to conventional drugs. These strains are thicker and stickier than previous strains, making them more challenging to treat with antibiotics.
Researchers analyzed S. lugdunensis isolates from pediatric patients and found that skin infections were a common source (68%), while CNS infections linked to VP shunts were also significant. Flucloxacillin was identified as effective against the bacterium.
Research reveals myxoma virus in rabbits has regained its deadly nature, sparking concerns about human viruses like SARS-CoV-2. The study suggests that viruses don't always evolve to become milder, and monitoring is crucial to stay ahead of emerging variants.
A recent study suggests that the BCG vaccine is effective in preventing tuberculosis (TB) in children under 5 years old. However, adolescents and adults may require additional protection to maintain immunity beyond childhood. The researchers emphasize the need for booster vaccinations and new TB vaccines to supplement the BCG vaccine.
A study by Goethe University Frankfurt found that antibodies against Omicron variants BA.1 and BA.2 decline rapidly, even after a second vaccination or booster shot, offering limited protection against infection.
Researchers created an atomic-level computational model of the COVID-19 spike protein, finding that human cell modifications increase its flexibility and mobility. The study suggests that these modifications can enhance virus infectivity and immune avoidance.
Researchers at University of Southern Denmark discover that certain fatty acids can neutralize disease-causing bacteria by turning off their ability to infect and spread. The discovery has potential implications for developing new treatments for antibiotic-resistant infections.
Researchers at the University of Alabama at Birmingham have discovered a gene essential for siderophore secretion in Mycobacterium tuberculosis, a key process for acquiring iron. The discovery validates siderophore secretion as a drug target for tuberculosis treatment and reveals a new mechanism for putative drugs.