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Total 27 results found since Jan 2013.

The unusual reproductive system of head and body lice (Pediculus humanus)
Medical and Veterinary Entomology,Volume 32, Issue 2, Page 226-234, June 2018.
Source: Medical and Veterinary Entomology - December 20, 2017 Category: Veterinary Research Authors: A. G. DE LA FILIA , S. ANDREWES , J. M. CLARK , L. ROSS Source Type: research

Children are suffering serious head lice infestations
Parasitologist Ian Burgess, director of the Medical Entomology Centre in Cambridge, warned parents' relaxed attitudes were contributing to an increase in serious infestations.
Source: the Mail online | Health - September 8, 2017 Category: Consumer Health News Source Type: news

Ovicidal Efficacy of Abametapir Against Eggs of Human Head and Body Lice (Anoplura: Pediculidae)
Studies were undertaken to determine the ovicidal efficacy of 5,5'-dimethyl-2,2'-bipyridyl (abametapir) against eggs of both human head and body lice. Head lice eggs of different ages (0–2, 3–5, and 6–8-d-old eggs) were exposed to varying concentrations of abametapir in isopropanol and concentration-dependent response relationships established based on egg hatch. One hundred percent of all abametapir-treated eggs failed to hatch at the 0.74 and 0.55% concentrations, whereas 100% of 6–8-d-old head louse eggs failed to hatch only at the 0.74% concentration. The LC50 value for abametapir varied, depend...
Source: Journal of Medical Entomology - January 11, 2017 Category: Biology Authors: Bowles, V. M., Yoon, K. S., Barker, S. C., Tran, C., Rhodes, C., Clark, M. J. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research

Chemical Resistant Head Lice Found In Mass.
BOSTON (CBS) – New clothes and a long list for the office supply store are all part of starting the school year. So too are concerns about head lice. The CDC estimates as many as 12 million children are infested every year and experts say it is getting harder to treat. Kerri Verrette of Danvers found that out the hard way when she got a call from her daughter’s school last year. “Hi your child has head lice and you have to go and pick them up,” she said. The phone call wasn’t the worst part. Trying to treat her daughter at home proved to be a real challenge. “[There were] lots of tears. I don’t know if ...
Source: WBZ-TV - Breaking News, Weather and Sports for Boston, Worcester and New Hampshire - September 9, 2016 Category: Consumer Health News Authors: Health – CBS Boston Tags: Health Local News Seen On WBZ-TV Syndicated Local Watch Listen Dr. Mallika Marshall lice Source Type: news

Host-Parasite Associations in Small Mammal Communities in Semiarid Savanna Ecosystems of East Africa
Despite the established importance of rodents as reservoirs of vector-borne zoonoses in East Africa, there is relatively limited information regarding the infestation parameters and host associations of ectoparasites that vector many such pathogens among small mammals in this region. Between 2009 and 2013, small mammals were live-trapped in the semiarid savanna of Kenya. A subset of these individual hosts, including 20 distinct host taxa, was examined for ectoparasites, which were identified to species. Species of fleas, ticks, mites, and sucking lice were recorded. Based on these data, we calculated host-specific infestat...
Source: Journal of Medical Entomology - June 29, 2016 Category: Biology Authors: Guerra, A. S., Eckerlin, R. P., Dowling, A. P. G., Durden, L. A., Robbins, R. G., Dittmar, K., Helgen, K. M., Agwanda, B., Allan, B. F., Hedlund, T., Young, H. S. Tags: Sampling, Distribution, Dispersal Source Type: research

Socioeconomical Factors Associated With Pediculosis (Phthiraptera: Pediculidae) in Athens, Greece
Pediculosis in humans and especially in children is a very common dermatological disorder caused by the ectoparasite Pediculus humanus capitis De Geer. We investigated the socioeconomic factors affecting the prevalence of pediculosis in the Greek urban area of Athens during 2004–2006. The target population consisted of children from kindergartens. In total, 434 children from single- or two-parent families were investigated with respect to socioeconomic factors such as education, income and family composition, and the prevalence of pediculosis. The overall pediculosis rate was 5.30%. Head louse infestations were signi...
Source: Journal of Medical Entomology - June 29, 2016 Category: Biology Authors: Tagka, A., Lambrou, G. I., Braoudaki, M., Panagiotopoulos, T., Papanikolaou, E., Laggas, D. Tags: Vector/Pathogen/Host Interaction, Transmission Source Type: research

Expansion of the Knockdown Resistance Frequency Map for Human Head Lice (Phthiraptera: Pediculidae) in the United States Using Quantitative Sequencing
Pediculosis is a prevalent parasitic infestation of humans, which is increasing due, in part, to the selection of lice resistant to either the pyrethrins or pyrethroid insecticides by the knockdown resistance (kdr) mechanism. To determine the extent and magnitude of the kdr-type mutations responsible for this resistance, lice were collected from 138 collection sites in 48 U.S. states from 22 July 2013 to 11 May 2015 and analyzed by quantitative sequencing. Previously published data were used for comparisons of the changes in the frequency of the kdr-type mutations over time. Mean percent resistance allele frequency (mean %...
Source: Journal of Medical Entomology - May 19, 2016 Category: Biology Authors: Gellatly, K. J., Krim, S., Palenchar, D. J., Shepherd, K., Yoon, K. S., Rhodes, C. J., Lee, S. H., Marshall Clark, J. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research

Backyard Chickens Harbor Ticks, Mites and Lice
Annapolis, MD; January 11, 2016 -- Backyard chickens may live a sweeter life than chickens on commercial poultry farms, but roaming green grass and scratching real dirt exposes these birds to a different suite of parasites than those found in most commercial facilities. A paper in the latest issue of the Journal of Medical Entomology by University of California, Riverside scientists Amy C. Murillo and Bradley A. read more
Source: ESA News - January 14, 2016 Category: Biology Authors: rlevine Tags: Press Releases Source Type: research

Backyard chickens harbor many parasites
(University of California - Riverside) Backyard chickens may not live as good of a life as most people think. Researchers at the University of California, Riverside have found backyard chickens are more likely than chickens on commercial chicken farms to be infested by ectoparasites, which are parasites such as fleas, lice and mites that live on the exterior of an organism. Their work was published online today in the Journal of Medical Entomology.
Source: EurekAlert! - Biology - January 11, 2016 Category: Biology Source Type: news

Patterns of cryptic host specificity in duck lice based on molecular data
Abstract Documenting patterns of host specificity in parasites relies on the adequate definition of parasite species. In many cases, parasites have simplified morphology, making species delimitation based on traditional morphological characters difficult. Molecular data can help in assessing whether widespread parasites harbour cryptic species and, alternatively, in guiding further taxonomic revision in cases in which there is morphological variation. The duck louse genus Anaticola (Phthiraptera: Philopteridae), based on current taxonomy, contains both host‐specific and widespread species. Mitochondrial and nuclear DNA s...
Source: Medical and Veterinary Entomology - December 1, 2015 Category: Veterinary Research Authors: G. C. ESCALANTE, A. D. SWEET, K. G. MCCRACKEN, D. R. GUSTAFSSON, R. E. WILSON, K. P. JOHNSON Tags: Original Article Source Type: research

The Chewing Lice (Insecta, Phthiraptera) Fauna of the Swainson's Warbler, Limnothlypis swainsonii (Aves, Parulidae)
We examined Swainson’s warblers (Limnothlypis swainsonii (Audubon, 1834), Aves: Parulidae) for lice fauna during 2 yr at three study sites in Arkansas, USA. A total of 66 individuals were examined; eight birds (10.6%) were parasitized with 16 lice of two new species belonging to two genera Myrsidea Waterson, 1915 (Amblycera: Menoponidae) and Brueelia Kéler, 1936 (Ischnocera: Philopteridae). Parasitological parameter data are given on the prevalence of lice on Swainson’s warblers. Species descriptions and illustrations are provided for Myrsidea bensoni sp. nov. and Brueelia limnothlypiae sp. nov.; includi...
Source: Journal of Medical Entomology - September 11, 2015 Category: Biology Authors: Valim, M. P., Reiley, B. M. Tags: Morphology, Systematics, Evolution Source Type: research

Cytogenetic Features of Human Head and Body Lice (Phthiraptera: Pediculidae)
In this study, we described the male and female karyotypes, and male meiosis of head and body lice, and examined the chromatin structure by means of C-banding. In P. h. humanus and P. h. capitis, the diploid chromosome complement was 2 n = 12 in both sexes. In oogonial prometaphase and metaphase and spermatogonial metaphase, it is evident that chromosomes lack of a primary constriction. No identifiable sex chromosomes or B chromosomes were observed in head and body lice. Neither chiasmata nor chromatin connections between homologous chromosomes were detected in male meiosis. The meiotic behaviour of the chromosomes showed ...
Source: Journal of Medical Entomology - September 11, 2015 Category: Biology Authors: Bressa, M. J., Papeschi, A. G., Toloza, A. C. Tags: Population Biology/Genetics Source Type: research

In Vitro and In Vivo Evaluation of Infestation Deterrents Against Lice
In this study, two nonclinical model systems (in vitro and in vivo) were used to determine the efficacy of the infestation deterrents, Elimax lotion and Elimax shampoo, against human head lice or poultry chewing lice, respectively. With in vitro assessments, female head lice exhibited significantly higher avoidance responses to hair tufts treated with either of the test formulations, which led to significantly higher ovipositional avoidance when compared with female lice on control hair tufts. Additionally, both formulations were determined to be competent infestation deterrents in a competitive avoidance te...
Source: Journal of Medical Entomology - September 11, 2015 Category: Biology Authors: Yoon, K. S., Ketzis, J. K., Andrewes, S. W., Wu, C. S., Honraet, K., Staljanssens, D., Rossel, B., Marshall Clark, J. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research