Articles tagged with Resistant Strains
A new study reviewing nearly 70 antimicrobial resistance studies suggests that aggressive treatment may not always be the best way to prevent resistant pathogens. The review found that varying drug dosages and treatment durations may affect resistance emergence, and moderate treatment could be a more effective strategy for some diseases.
Researchers found that the European CA-MRSA clone CC80 evolved from a sub-Saharan African methicillin-sensitive ancestor. The bacteria simultaneously acquired resistance to methicillin and fusidic acid, which is thought to be due to selective pressure in North Africa and Europe.
Research found that a particular strain of Pseudomonas aeruginosa survived in contact lens cleaning solution for over four hours, posing a risk to eye health. The study suggests that standard disinfectant solutions may not be robust enough to kill all bacteria associated with microbial keratitis.
Researchers at EPFL have developed a tool to identify mutations that make the flu virus resistant to Tamiflu. By analyzing the genetic code of the virus, they discovered new mutations that may render the current treatment ineffective, highlighting the need for further investigation.
A single strain of Escherichia coli, known as H30-Rx, has become the main cause of bacterial infections worldwide, spreading from urinary tract to blood and causing lethal sepsis. The study's findings suggest that this superbug may be responsible for 1.5 million UTIs and tens of thousands of deaths annually in the US.
Researchers found that certain mice develop IRG proteins, a resistance mechanism that prevents the parasites from killing them. This balance between parasite virulence and host resistance allows the infected mice to survive long enough for the parasites to complete their cycle.
Researchers used phylogenetics to analyze whole genome sequences of TB, revealing 39 new genes associated with elevated drug resistance. The findings suggest a multistep process for acquiring resistance and implications for targeted detection methods.
Recent study found that 35% of H7N9 viruses are resistant to oseltamivir and zanamivir due to a faulty enzyme-based test. Gene-based surveillance techniques can detect these resistant strains, which could spread if not treated properly.
A new study suggests that recent changes in prescribing practice have delayed the emergence of multi-drug resistant gonorrhoea. The findings show a decline in effectiveness of cephalosporins against gonorrhea, but a change in treatment guidelines may have reversed this trend.
A study found that rotating nematode-resistant wheat with tomato plants reduces nematode numbers in soil and protects the next crop. The resistant wheat was bred with a gene that makes it less susceptible to root-knot nematodes, which cause significant damage to crops worldwide.
Scientists traced the origin and development of vancomycin-resistant S. aureus by analyzing genome sequences of 12 strains. The study found that each strain acquired resistance independently and identified shared features among the strains that may have helped them evade human immune defenses.
Scientists have developed two new Bt toxins, Cry1AbMod and Cry1AcMod, to overcome resistance in pest insects. These novel toxins are effective against five resistant species, including the diamondback moth and European corn borer.
A new study reveals that antivirulence drugs can suppress resistance in pathogens by targeting social interactions and cooperation. Laboratory simulations showed that resistant strains will not overtake sensitive strains when therapies target cell-to-cell communication, allowing antivirulence therapies to work even when resistance arises.
A UA-led team of researchers discovered a new edge in overcoming resistance to certain pests by modifying the structure of crop-protecting proteins called Bt toxins. The modified toxins were found to be effective against some resistant strains, but not always working as expected and requiring further testing.
Researchers mapped the global spread of drug-resistant influenza, revealing that genetic mutations and human migration through air travel can lead to rapid transmission. The study suggests that a combination of factors, including overuse of antiviral drugs and human movement, contribute to the emergence of resistant strains.
A study of 24 patients found that repeated exposure to fluoroquinolone and azithromycin antibiotics increased resistance to multiple drugs, including older- and newer-generation antibiotics. This raises concerns about the judicious use of ophthalmic antibiotics to prevent antimicrobial resistance.
Researchers discovered a new mechanism of resistance to daptomycin in enterococcus strains, which can be attributed to mutations in the cardiolipin synthase gene. This finding provides valuable information on how antibiotics work and could lead to the development of better treatments for resistant infections.
Researchers identified a new gonorrhea strain, H041, with extreme resistance to cephalosporin-class antibiotics. This discovery poses a significant threat to public health as the last remaining effective treatments are no longer effective against the bacterium.
In a structured community of Escherichia coli bacteria, restrained strains thrived by curbing pursuit of producers, while unrestrained strains faced long-term demise. The phenomenon has implications for other ecological systems.
Scientists identify novel MRSA strain with highly divergent genes not detected by traditional methods, suggesting transmission from animals to humans. The study highlights the emergence of new MRSA strains from animal reservoirs in Ireland and Europe.
A Cardiff University-led team discovered antibiotic-resistant bacteria carrying the NDM-1 gene in New Delhi's drinking water supply, including strains that cause cholera and dysentery. The findings highlight the need for urgent action to tackle the spread of resistant bacteria worldwide.
Scientists from the University of Oxford developed a new strategy to combat antibiotic resistance by increasing the biological cost of resistant bacteria. The approach aims to reduce the competitiveness of drug-resistant strains and prolong the effectiveness of existing antibiotics.
Scientists at Purdue University found that many wheat lines carrying resistance genes are ineffective against Hessian flies in the southeastern US. The study suggests that combining two unreleased genes may be the best option to create more effective resistance.
Researchers have identified a genetic basis for broad-spectrum resistance to the Turnip mosaic virus, which affects key brassica crops. The team's breakthrough could lead to the development of commercial varieties with improved resistance, boosting UK crop yields and food security.
Researchers found that bacteria with highly resistant isolates sacrifice their own fitness to produce indole, helping vulnerable members survive antibiotics. This complex behavior was previously unknown and has significant implications for understanding bacterial strains and antibiotic resistance.
Researchers at Boston University and Harvard discovered that bacteria produce indole to help vulnerable members survive antibiotic attacks, but this comes at the cost of their own well-being. This finding sheds new light on the complexity of bacterial strains and has significant implications for the medical community.
The ST131 strain of E. coli is a major cause of serious antimicrobial-resistant infections in the US, accounting for 67-69% of resistant isolates. Researchers urge discovering its sources to prevent further spread.
Researchers pinpointed molecular changes that enabled Tamiflu-resistant H1N1 flu viruses to replicate and spread globally. The study revealed two secondary mutations in the neuraminidase gene of resistant strains, allowing them to overcome previous inhibitory effects of Tamiflu.
Researchers predict that a combination of drugs targeting three or more mutated strains of the hepatitis C virus is necessary to eradicate the virus. The findings suggest that a new treatment approach involving multiple direct-acting antivirals may be needed, potentially shortening treatment duration and improving cure rates.
ARS researchers have inserted individual resistance genes from a wild oat into domestic oat varieties, developing new lines with effective resistance to crown rust. The goal is to create plant lines that will fight off the disease for many years, improving oat yields and food security.
A new study by Henry Ford Hospital finds that a specific MRSA strain, USA600, causes significantly higher mortality rates compared to other strains. The researchers believe this strain's unique characteristics may be the key to understanding its high lethality.
A new swine flu test developed by TGen can quickly inform doctors about the strain of flu and whether it may be resistant to oseltamivir, a primary anti-viral drug. The test has been shown to be effective in detecting resistance to Tamiflu in H1N1 virus strains.
In a study published in Nature, researchers found that cooperative amoebas can evolve genetic defenses against cheaters, preserving collective behavior. The Dictyostelium discoideum mutants discovered by the Rice-Baylor team demonstrated a remarkable ability to resist cheater cells and maintain altruistic traits.
A study found that typhoid fever cases in the US are often associated with international travel to the Indian subcontinent and are increasingly resistant to common treatments. The majority of cases were linked to travelers who visited friends or family, highlighting the need for improved vaccination coverage and prevention measures.
Widespread misuse of fluoroquinolones is creating a strain of fluoroquinolone-resistant TB, according to new research. Patients who use fluoroquinolones within 12 months of diagnosis are almost five times more likely to have resistant TB.
Research on clarithromycin resistance in Helicobacter pylori isolates from Malaysian patients revealed low prevalence rates and specific mutations. The study found transitions of adenine to guanine at positions 2142 and 2143 of the 23S rRNA gene, detectable through restriction fragment length polymorphism analysis.
Researchers analyzed 700 genome sequences of avian influenza strains to document resistance to adamantane antivirals. The study suggests that widespread antiviral drug use can accelerate the evolution of drug-resistant viruses, which can spread rapidly.
Researchers at Rensselaer Polytechnic Institute have discovered that genetic predisposition and initial seizures can set the stage for later onset of epilepsy. The study used animal models to analyze seizure behavior and identified a genetic component that protects against long-lasting brain changes after initial seizures.
Researchers found a small protein secreted by some fungal strains can suppress tomato disease resistance genes, but a third gene targets this protein, rendering the plant fully immune. The study provides a new strategy for durable disease control based on resistance gene combinations.
Researchers found a higher incidence of community-acquired pneumonia (CAP) caused by Staphylococcus aureus, including antibiotic-resistant strains like MRSA. The study revealed a lower case-fatality rate than previously estimated, at around 13%.
Researchers used genome sequencing to detect rare viral mutations and found that low-frequency resistant HIV strains can lead to premature therapy failure. The study aimed to determine if patients who fail treatment early were initially infected with drug-resistant strains.
A study suggests that the majority of drug-resistant TB cases among patients undergoing treatment are caused by new infections, not acquired resistance. This finding could drive a major shift in strategy for controlling TB.
Researchers discover novel mechanism of gene-for-gene resistance in plant immune system, providing insights into enhancing crop yield and combating agricultural losses. The study reveals that the N resistance protein recognizes pathogen Avr proteins through a different region on its Toll-interleukin-1 receptor homology domain.
A mathematical model suggests that widespread use of antiviral drugs like oseltamivir can quickly spread resistant viruses, even if they emerge rarely. Prophylaxis and treatment with oseltamivir would still delay the onset of the pandemic and reduce its total size.
Researchers have identified the genetic sequence of the USA300 strain, which has incorporated parts of another bacterium's genome, enabling it to evade host immune responses and survive. This discovery provides a diagnostic tool to monitor the spread of the strain in hospital and community settings.
Researchers at Purdue University have discovered a new gene, called H31, that can help wheat plants resist damage from the Hessian fly. By combining this gene with others, they aim to extend resistance time by up to six times, reducing the need for chemicals and preserving the environment.
Scientists at the University of Massachusetts have developed a way to grow colonies of mutated head lice in a laboratory setting. This allows them to examine the biochemical and molecular mechanisms of resistance and monitor the frequency of mutations that cause resistance.
Researchers have identified a gene that confers high levels of resistance in the tobacco budworm moth to genetically engineered crops with built-in insecticides. This discovery will enable farmers and government officials to take early steps to prevent uncontrollable outbreaks by detecting the early signs of pests evolving resistance.
Researchers discover the structure of a key compound enabling the bacterium's deadly mechanism and create molecules that block its effects in mice. The study provides a novel way to combat Staphylococcus aureus infections without killing the bacteria, potentially addressing antibiotic resistance.
The international panel emphasizes that blood tests measuring HIV levels and CD4 cells should guide treatment decisions, rather than resistance testing. The panel also highlights the limitations of current resistance assays and recommends further epidemiological studies to monitor resistant strain prevalence.
Researchers developed a model to predict antiviral drug resistance in genital herpes, finding that treating the disease would prevent more cases than developing resistant strains. The study suggests using this methodology for other infectious diseases prone to resistance.
A new, aggressive strain of the late blight fungus, US-8, is devastating potato fields in the US and Canada, resistant to metalaxyl, a commonly used fungicide. The fungus reproduces rapidly, producing massive numbers of spores that can infect stored potatoes, leading to widespread crop loss.
Researchers found synergy in two strains of Enterococcus faecalis when combining trovafloxacin and ampicillin/sulbactam, but not in other tested strains. Combination antibiotic treatment remains the only effective means to eliminate vancomycin-resistant enterococcal infections.
Researchers have identified three genes connected to stroke in hypertensive rats, with two protecting against the disease and one predisposing it. The study sheds light on the complex nature of stroke, which is influenced by multiple genetic factors beyond well-known risk factors.