Bioassays to evaluate non-contact spatial repellency, contact irritancy, and acute toxicity of permethrin-treated clothing against nymphal Ixodes scapularis ticks

Publication date: Available online 1 July 2017 Source:Ticks and Tick-borne Diseases Author(s): Lars Eisen, Dominic Rose, Robert Prose, Nicole E. Breuner, Marc C. Dolan, Karen Thompson, Neeta Connally Summer-weight clothing articles impregnated with permethrin are available as a personal protective measure against human-biting ticks in the United States. However, very few studies have addressed the impact of contact with summer-weight permethrin-treated textiles on tick vigor and behavior. Our aim was to generate new knowledge of how permethrin-treated textiles impact nymphal Ixodes scapularis ticks, the primary vectors in the eastern United States of the causative agents of Lyme disease, human anaplasmosis, and human babesiosis. We developed a series of bioassays designed to: (i) clarify whether permethrin-treated textiles impact ticks through non-contact spatial repellency or contact irritancy; (ii) evaluate the ability of ticks to remain in contact with vertically oriented permethrin-treated textiles, mimicking contact with treated clothing on arms or legs; and (iii) determine the impact of timed exposure to permethrin-treated textiles on the ability of ticks to move and orient toward a human finger stimulus, thus demonstrating normal behavior. Our results indicate that permethrin-treated textiles provide minimal non-contact spatial repellency but strong contact irritancy against ticks, manifesting as a “hot-foot” effect and resulting in ticks actively dislodgi...
Source: Ticks and Tick borne Diseases - Category: Zoology Source Type: research

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For most of us, springtime marks the return of life to a dreary landscape, bringing birdsong, trees in bud, and daffodils in bloom. But if you work for the Centers for Disease Control and Prevention (CDC), the coming of spring means the return of nasty diseases spread by ticks and mosquitoes. The killjoys at CDC celebrated the end of winter with a bummer of a paper showing that infections spread by ticks doubled in the United States from 2004 to 2016. (Tick populations have exploded in recent decades, perhaps due to climate change and loss of biodiversity.) Lyme disease The most common infection spread by ticks in the US i...
Source: Harvard Health Blog - Category: Consumer Health News Authors: Tags: Health Infectious diseases Source Type: blogs
This article originally appeared on Health.com
Source: TIME: Health - Category: Consumer Health News Authors: Tags: Uncategorized healthytime onetime public health Source Type: news
The following data are abstracted from Gideon and the Gideon e-book series. [1]  Charts were created using an interactive tool driven by over 30,000 base graphs in the program. [2] Chart 1 contrasts trends for reported incidence of Lyme disease and Rocky Mountain spotted fever (RMSF).  Note that while rates of Lyme disease in 2016 are 15-fold those reported in 1987, those of RMSF increased by a factor of seven.  The number of fatal cases for both diseases have remained similar in recent years (i.e., the relative case-fatality rate of Lyme disease has decreased) Chart 2 summarizes incidence data for a variet...
Source: GIDEON blog - Category: Databases & Libraries Authors: Tags: Ebooks Epidemiology Graphs ProMED Source Type: blogs
Publication date: Available online 31 January 2018 Source:Ticks and Tick-borne Diseases Author(s): Lars Eisen The blacklegged tick, Ixodes scapularis, is the primary vector to humans in the eastern United States of the deer tick virus lineage of Powassan virus (Powassan virus disease); the protozoan parasite Babesia microti (babesiosis); and multiple bacterial disease agents including Anaplasma phagocytophilum (anaplasmosis), Borrelia burgdorferi and Borrelia mayonii (Lyme disease), Borrelia miyamotoi (relapsing fever-like illness, named Borrelia miyamotoi disease), and Ehrlichia muris eauclairensis (a minor causative age...
Source: Ticks and Tick borne Diseases - Category: Zoology Source Type: research
Publication date: Available online 15 December 2017 Source:Ticks and Tick-borne Diseases Author(s): Andrea Egizi, Vivien Roegner, Ary Faraji, Sean P. Healy, Terry L. Schulze, Robert A. Jordan Historical specimens, when available, can provide new insight into the distribution and evolution of pathogens that may not be discernible from more recent samples. We used ticks collected from hunter-killed white-tailed deer in New Jersey in 2002 to examine the prevalence and distribution of four pathogens transmitted by Ixodes scapularis, the blacklegged tick. Infection with Borrelia burgdorferi sensu stricto, Babesia microti, and ...
Source: Ticks and Tick borne Diseases - Category: Zoology Source Type: research
Publication date: Available online 10 December 2017 Source:Ticks and Tick-borne Diseases Author(s): Christine B. Graham, Sarah E. Maes, Andrias Hojgaard, Amy C. Fleshman, Sarah W. Sheldon, Rebecca J. Eisen The incidence and geographic range of tick-borne illness associated with Ixodes scapularis and Ixodes pacificus have dramatically increased in recent decades. Anaplasmosis, babesiosis, and Borrelia spirochete infections, including Lyme borreliosis, account for tens of thousands of reported cases of tick-borne disease every year. Assays that reliably detect pathogens in ticks allow investigators and public health agencie...
Source: Ticks and Tick borne Diseases - Category: Zoology Source Type: research
Ticks and the diseases they carry have long been recognized as health concerns, especially in the warmer months when ticks (and humans) are more active. Ticks wait on grass tips or shrubs to latch onto new hosts when they brush by. Most of the hosts are animals, but a few tick species do bite and feed on humans. While doing so, they can transmit bacteria and viruses through their saliva. But here’s what’s changing: Tick species are being found in a wider geographic range. The number of case reports of tick-borne illnesses is increasing. Scientists continue to identify new pathogens (bacteria and viruses that c...
Source: Harvard Health Blog - Category: Consumer Health News Authors: Tags: Health Infectious diseases Prevention Safety Travel health Source Type: blogs
Ticks and the diseases they carry have long been recognized as health concerns, especially in the warmer months when ticks (and humans) are more active. Ticks wait on grass tips or shrubs to latch onto new hosts when they brush by. Most of the hosts are animals, but a few tick species do bite and feed on humans. While doing so, they can transmit bacteria and viruses through their saliva. But here’s what’s changing: Tick species are being found in a wider geographic range. The number of case reports of tick-borne illnesses is increasing. Scientists continue to identify new pathogens (bacteria and viruses that c...
Source: Harvard Health Blog - Category: Consumer Health News Authors: Tags: Health Infectious diseases Prevention Safety Travel health Source Type: blogs
Abstract Babesiosis is an emerging zoonotic disease caused primarily by Babesia microti, an intraerythocytic protozoan. Babesia microti, like the causal agents for Lyme disease and anaplasmosis, is endemic to the northeastern and upper midwestern United States where it is usually transmitted by the blacklegged tick, Ixodes scapularis. Although babesiosis is usually a mild to moderate illness, older or immunocompromised persons can develop a serious malaria-like illness that can be fatal without prompt treatment. The most common initial clinical signs and symptoms of babesiosis (fever, fatigue, chills, and diaphore...
Source: MMWR Morb Mortal Wkl... - Category: Epidemiology Authors: Tags: MMWR Morb Mortal Wkly Rep Source Type: research
Tick season is upon us, and it’s shaping up to be a real doozy. Scientists predict 2017 will bear the highest number of ticks in recent years, with a jump in reported cases of tick-borne illnesses in some regions of the U.S. Ticks are thriving thanks to a recent explosion of the white-footed mice population, which carry Lyme disease, Powassan virus and other tick-borne illnesses. Meanwhile, warmer winters caused by climate change are allowing ticks to remain active longer and carry diseases into new regions of the U.S. Experts suggest people living in regions where these diseases are most prevalent ― the North...
Source: Science - The Huffington Post - Category: Science Source Type: news
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