Breaking News
February 19, 2019 - Scientists untangle how microbes manufacture key antibiotic compound
February 19, 2019 - Greater primary care physician supply associated with longer life spans
February 19, 2019 - HIV-1 protein suppresses immune response more broadly than thought
February 19, 2019 - For 2020 Dem Hopefuls, ‘Medicare-For-All’ Is A Defining Issue, However They Define It
February 19, 2019 - KU professor discusses promise of brain-computer interface to aid, restore communication
February 19, 2019 - Early marker of cardiac damage triggered by cancer treatment identified
February 19, 2019 - Antidepressant drug could save people from deadly sepsis, research suggests
February 19, 2019 - CRISPR technology creates pluripotent stem cells that are ‘invisible’ to the immune system
February 19, 2019 - Midlife Systemic Inflammation Linked to Later Cognitive Decline
February 19, 2019 - Therapy derived from parasitic worms downregulates proinflammatory pathways
February 19, 2019 - Antimicrobial reusable coffee cups are less likely to become contaminated with bacteria, study shows
February 19, 2019 - Harnessing the evolutionary games played by cancer cells to advance therapies
February 19, 2019 - AHA News: Heart Transplant Survivor Gets Wedding Proposal at Finish Line
February 19, 2019 - HIV hidden in patients’ cells can now be accurately measured
February 19, 2019 - Research finds reasons for sudden cardiac death in patients with stable ischemic disease
February 19, 2019 - New protocol could help physicians to rule out bacterial infections in infants
February 19, 2019 - Women experiencing miscarriage should be offered treatment choices
February 19, 2019 - New protocol can help identify febrile infants at low risk for serious bacterial infections
February 19, 2019 - Innovative way to block HIV runs into a roadblock
February 19, 2019 - Springer Nature with BCRF conduct pilot project to make their research datasets more accessible
February 19, 2019 - Study finds neuromelanin-sensitive MRI as potential biomarker for psychosis
February 19, 2019 - Improvements in cardiovascular care for elderly save billions in health care costs
February 19, 2019 - Chilean food regulations are changing food perceptions and purchasing habits, study suggests
February 19, 2019 - Index endoscopy results are crucial for assessment of Barrett’s patients
February 18, 2019 - Breast cancer screening age should be lowered to 35
February 18, 2019 - Brain synchronization depends on the language of communication
February 18, 2019 - Drug Company Payments Over Time May Influence Rx Practices
February 18, 2019 - Despite socioeconomic gains, black-white ‘health gap’ remains
February 18, 2019 - Researchers report progress in the treatment of aggressive brain tumors
February 18, 2019 - Scientists discover trigger that turns strep infections into devastating disease
February 18, 2019 - Scanning children’s teeth may predict future mental health issues
February 18, 2019 - Health Highlights: Feb. 14, 2019
February 18, 2019 - New knowledge could help predict and prevent depression
February 18, 2019 - More primary care physicians leads to longer life spans | News Center
February 18, 2019 - Study examines link between supply of primary care physicians and life expectancy
February 18, 2019 - New study assesses screen time in young children
February 18, 2019 - Patented IU discovery to treat ARDS has been optioned to Theratome Bio
February 18, 2019 - Software found to be four times better at monitoring ovarian cancer
February 18, 2019 - Male Y chromosomes not ‘genetic wastelands’
February 18, 2019 - Hormone therapy during gender transition may increase risk for cardiovascular events
February 18, 2019 - NICE renews accreditation for Advanced
February 18, 2019 - FDA Grants Orphan Drug Designation to Amplyx Pharmaceuticals for APX001 for Treatment of Cryptococcosis
February 18, 2019 - Molecule effective in killing tuberculosis bacteria
February 18, 2019 - Columbia researchers unravel why some glioblastomas respond to immunotherapy
February 18, 2019 - Men who are able to do ten push-ups are less likely to have a stroke
February 18, 2019 - Blood-brain barrier disruption could lead to age-related cognitive decline
February 18, 2019 - Combination of PARP inhibitor and immunotherapy results in tumor regression in SCLC mouse models
February 18, 2019 - Heavy smoking could lead to vision loss, study finds
February 18, 2019 - New diagnostic test for malaria uses spit, not blood
February 18, 2019 - New therapeutic molecules show promise in reversing memory loss related to depression, aging
February 18, 2019 - Darla Shine joins anti-vaccination campaigners
February 18, 2019 - New study outlines sex-specific issues in ischemic heart disease
February 18, 2019 - Drug combinations could become first-line treatment for metastatic kidney cancer
February 18, 2019 - Lifetime adversity, increased neural processing during trauma combine to intensify core PTSD symptoms
February 18, 2019 - HRQoL Scores Decrease With Treatment Line in Multiple Myeloma
February 18, 2019 - Convincing evidence that type 2 diabetes is a cause of erectile dysfunction
February 18, 2019 - Study offers implications of advanced age in evaluation, management of ischemic heart disease
February 18, 2019 - Children from homes with flame-retardant sofa have high SVOC concentration in their blood
February 18, 2019 - Art Institute of Chicago announces results of research on five terracotta sculptures
February 18, 2019 - New PET/CT tracer shows high detection rate for diagnosis of acute venous thromboembolism
February 18, 2019 - Smoking may blight immune response against melanoma and reduce survival
February 18, 2019 - How Inactivity and Junk Food Can Harm Your Brain
February 18, 2019 - Diabetes tops common conditions for frequent geriatric emergency patients
February 18, 2019 - Longer-lived sperm produces offspring with healthier lifespans
February 18, 2019 - New dental adhesive prevents tooth decay around orthodontic brackets
February 18, 2019 - New eHealth tool shows potential to improve quality of asthma care
February 18, 2019 - New Australian initiative helps emergency clinicians to improve patient care
February 17, 2019 - Apellis Pharmaceuticals’ APL-2 Receives Fast Track Designation from the FDA for the Treatment of Patients with Paroxysmal Nocturnal Hemoglobinuria
February 17, 2019 - Researchers identify faulty ‘brake’ that interferes with heart muscle’s ability to contract and relax
February 17, 2019 - Support from trusted adults can reduce risk of dying in suicidal teens, finds study
February 17, 2019 - Heart attack awareness improved since 2008
February 17, 2019 - Exercise gives a better brain boost to older men than women
February 17, 2019 - New research disproves previous assumptions of how looks influence personality
February 17, 2019 - Cannabis use as a teenager linked to depression later in life
February 17, 2019 - Sinks by Toilets in ICU Patient Rooms Harbor Harmful Bacteria
February 17, 2019 - Cancer cells’ plasticity makes them harder to stop
February 17, 2019 - Young cannabis users have increased risk of depression and suicidal behavior
February 17, 2019 - Tasmanian Devils Likely to Survive Cancer Scourge
February 17, 2019 - Neoadjuvant PD-1 blockade seems effective in glioblastoma
February 17, 2019 - Personal, social factors play role in enabling sustainable return to work after ill health
Scientists use mice to study transmission of Lyme disease bacteria by infected ticks

Scientists use mice to study transmission of Lyme disease bacteria by infected ticks

image_pdfDownload PDFimage_print

Lyme borreliosis is a disease caused by bacteria of the genus Borrelia that are transmitted by a bite from a tick of the genus Ixodes. Scientists from the Institut Pasteur used mice to study the transmission of bacteria by ticks infected with various European and North American species of Borrelia. They found evidence of rapid bacterial transmission following a bite, with infection occurring within 24 hours of an adult tick bite and sometimes even sooner for nymph bites. This is a timely reminder of the importance of removing ticks as soon as possible after being bitten to prevent infection.

Lyme borreliosis is the most common vector-borne disease in Europe. It is caused by spirochetes belonging to the Borrelia burgdorferi sensu lato complex. This complex includes several species that are pathogenic for humans: Borrelia burgdorferi sensu stricto, B. afzelii, B. garinii, B. bavariensis, B. spielmanii, B. valaisiana and B. lusitaniae. The bacteria are transmitted through a bite from a hard tick of the genus Ixodes – in Europe, primarily Ixodes ricinus. Ticks can infect a wide variety of hosts. Humans are considered to be an accidental host; transmission can occur if they come into contact with an environment favorable to ticks.

Ticks have three lifecycle stages that can bite humans – larva, nymph and adult -, but bacteria are usually transmitted through bites from nymphs, which are higher in density and often go unnoticed because of their small size.

The amount of time a tick must remain attached to transmit bacteria to the vertebrate host is an essential parameter in assessing the risk of transmission and identifying measures to prevent infection. It is generally accepted that the longer a tick remains attached, the higher the risk of transmission. In Europe, it is regularly stated that there is a real risk of transmission only after 24 hours of attachment.

In this study, we used a mouse model to determine the kinetics of infection by Ixodes ricinus ticks (nymphs and adult females) infected with various European and North American strains or species of Borrelia. We also compared the dissemination of various strains and species of Borrelia by different modes of inoculation (via infected ticks or by injection of bacteria).

Unlike the American strains, all the European species of B. burgdorferi that we studied were detected in the salivary glands of adult ticks before a blood meal, suggesting the possibility of rapid transmission of the bacteria following a bite. The results were consistent with this theory: infection occurred within 24 hours of a bite from an adult tick. Moreover, our analysis shows that nymphs infected by European species of B. burgdorferi are capable of transmitting these pathogens within 12 hours of attachment. Our study proves that B. burgdorferi can be transmitted more quickly than stated in the literature. It is therefore vital to remove ticks as soon as possible after being bitten to prevent infection.

Furthermore, the study shows that the tropism of Borrelia varies depending on the strain and species studied, which explains the variety of clinical manifestations of Lyme borreliosis. We also demonstrate a difference in the tropism of Borrelia following a tick bite, confirming the role of tick saliva in the efficacy of infection and dissemination in vertebrate hosts.

Source:

https://www.pasteur.fr/en/research-journal/news/lyme-disease-study-speed-transmission-infected-ticks

Tagged with:

About author

Related Articles