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Demodex mite

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https://www.readbyqxmd.com/read/28399378/the-adult-and-immature-stages-of-the-new-species-of-the-genus-demodex-acariformes-demodecidae-with-data-on-parasitism-topography-and-topical-specificity-of-demodecid-mites-in-the-yellow-necked-mouse-apodemus-flavicollis-rodentia-muridae
#1
Joanna N Izdebska, Leszek Rolbiecki, Sławomira Fryderyk, Łukasz Mierzyński
Demodex mollis n. sp. is described from the yellow-necked mouse Apodemus flavicollis (Melchior, 1834) from Poland. It is a medium-sized demodecid mite (adult stages are on average 249 µm long) observed in the skin of the eyelid area. The new species is most similar to two other species occupying similar microhabitat in hosts of the same genus - Demodex lacrimalis Lukoschus and Jongman, 1974 from Apodemus sylvaticus Linnaeus, 1758 and Demodex huttereri Mertens, Lukoschus and Nutting, 1983 from Apodemus agrarius (Pallas, 1771), but differs by the following features: the terminal palpi are equipped with 3 spines, including 1 large claw-like and the second single; subgnathosomal setae (setae n) are situated on both sides of the anterior side of the pharyngeal bulb; claws on the leg tarsi are bifurcated and each equipped with large subterminal spur and proximal pointed projection; the opisthosoma is soft and flexible; and aedeagus in males have different shape and localization...
April 11, 2017: Journal of Parasitology
https://www.readbyqxmd.com/read/28392639/demodex-mite-density-determinations-by-standardized-skin-surface-biopsy-and-direct-microscopic-examination-and-their-relations-with-clinical-types-and-distribution-patterns
#2
Chul Hyun Yun, Jeong Hwan Yun, Jin Ok Baek, Joo Young Roh, Jong Rok Lee
BACKGROUND: Demodicosis is a parasitic skin disease caused by Demodex mites, and the determination of mite density per square centimeter is important to diagnose demodicosis. Standardized skin surface biopsy (SSSB) and direct microscopic examination (DME) are commonly used to determine Demodex mites density (Dd). However, no study has previously compared these two methods with respect to clinical types and distribution patterns of demodicosis. OBJECTIVE: The aim of this study was to compare the value of SSSB and DME findings in reference to the clinical types and distribution patterns of demodicosis...
April 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28369843/the-effect-of-skin-moisture-ph-and-temperature-on-the-density-of-demodex-folliculorum-and-demodex-brevis-acari-demodicidae-in-students-and-staff-of-the-erzincan-university-turkey
#3
Erhan Zeytun, Engin Tilki, Salih Doğan, Kosta Yani Mumcuoğlu
BACKGROUND: The aim of this study was to determine the prevalence and density of Demodex folliculorum and Demodex brevis in students and staff of the Erzincan University, Turkey, and to define the influence of age, gender, educational level, and hygiene as well as skin moisture, pH, and temperature on the presence of Demodex mites. METHODS: Healthy people without apparent facial dermatoses from nine faculties and five vocational schools of the university were included in the study...
March 30, 2017: International Journal of Dermatology
https://www.readbyqxmd.com/read/28347561/-the-value-of-reflectance-confocal-microscopy-in-detection-of-demodex-mites
#4
Y Harmelin, F Le Duff, T Passeron, J-P Lacour, P Bahadoran
No abstract text is available yet for this article.
March 24, 2017: Annales de Dermatologie et de Vénéréologie
https://www.readbyqxmd.com/read/28329621/facial-pigmentation-with-demodex-mite-a-mere-coincidence-or-an-association
#5
Betul Sereflican, Bengu Tuman, Cetin Boran, Nadir Goksugu, Ali Haydar Parlak, Mualla Polat
Demodex mites may induce inflammatory cutaneous reactions such as papulopustular rosacea and demodex folliculitis; both may lead to post inflammatory pigmentation. A 59-year-old man presented with an asymptomatic, hyperpigmented plaque on his face. Histological and clinical findings displayed Riehl-like facial pigmentation. Multiple demodex mites at the follicular infundibulum in the biopsy material were remarkable. There are limited publications about demodex-associated pigmentation. We report this case to point out that various hyperpigmentation disorders may occur simultaneously with demodex mites...
September 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28329574/a-rare-clinical-manifestation-of-spinulate-demodicosis
#6
Funda Tamer, Evren Sarifakioglu, Ozge Mine Orenay
Demodicosis is a chronic skin disease caused by Demodex mites such as Demodex folliculorum and Demodex brevis. Demodex mites live in pilosebaceous units and they are regarded as a part of the normal skin flora. Nevertheless, it has been suggested that the presence of five or more mites per cm² by the standardized skin surface biopsy technique could be considered as pathogenic.
November 15, 2016: Dermatology Online Journal
https://www.readbyqxmd.com/read/28326184/unilateral-demodicidosis-of-face-mimicking-hansens-disease
#7
Deepak Vashisht, Jatinder Singh, Sukriti Baveja, Rohit Tiwari, Anuj Bhatnagar
Demodicosis is a common parasitic infection of the hair follicles and the pilosebaceous unit by the Demodex mites viz. Demodex folliculorum and Demodex brevis. Infection by this parasite is common among immunocompromised and elderly. We report a case of facial Demodicosis which presented like atypical rosacea with a gradually progressing swelling and redness on right side of face which was initially diagnosed as a case of Hansen's disease. Skin biopsy revealed follicular dilatation with presence of Demodex mite along with intense perifollicular lymphomononuclear infiltrate...
June 15, 2016: Dermatology Reports
https://www.readbyqxmd.com/read/28316406/prevalence-of-ectoparasites-in-dogs-of-shimoga-karnataka
#8
C M Krishna Murthy, K J Ananda, J Adeppa
A study was carried out to ascertain the status of ecto-parasites infesting dogs of Shimoga region. A total of 120 dogs with the history of skin problems presented to the local hospitals and local pet clinics of Shimoga region were screened for different ecto-parasites. The ticks, fleas and lice were collected, processed and identified. The skin scrapings were also collected from the affected dogs and processed for identification of mites. Out of 120 dogs examined, 59 (49.1 %) had harboured ecto-parasites...
March 2017: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/28288772/first-report-of-vascular-invasion-of-demodex-mites-with-thrombi-and-dissemination-to-visceral-lymph-nodes-in-a-dog
#9
Moges Woldemeskel, Ian Hawkins
An adult-onset generalized canine demodecosis is a life threatening form of demodecosis often seen in immunocompromised dogs. A generalized, adult-onset canine demodecosis with an unusual vascular invasion, thrombi and dissemination to peripheral, and visceral lymph nodes was diagnosed in an adult, female, American Bulldog of unknown age. Organized thrombi with intralesional mites were observed in multiple lymphatic vessels and in a section of blood vessel. Vascular invasion of mites with dissemination of mites into visceral lymph nodes, is an unusual findings not previously recorded in canine generalized demodecosis...
March 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28274359/demodex-and-rosacea-revisited
#10
Ellen M Moran, Ruth Foley, Frank C Powell
Demodex mites are part of the vast microbiome living on and within human skin. The interaction of the various microorganisms with the skin plays a key role in the maintenance of homeostasis. The precise role and function of Demodex mites within normal and diseased human skin remains elusive. The emergence of ivermectin as a key therapy for rosacea has refocused interest in the role of Demodex mites in the pathogenesis of this skin disease and the ability of Demodex to modulate the host immune system.
March 2017: Clinics in Dermatology
https://www.readbyqxmd.com/read/28149788/prevalence-of-ocular-demodicosis-among-patients-at-tertiary-care-center-bangkok-thailand
#11
Ngamjit Kasetsuwan, Kitchaporn Kositphipat, Mathu Busayarat, Pawanrat Threekhan, Kanok Preativatanyou, Atchara Phumee, Padet Siriyasatien
AIM: To determine the prevalence of ocular demodicosis by both microscopic examination and molecular detection among patients at King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok. METHODS: One hundred individuals were enrolled in the study and were divided into five age groups. The meibomian gland dysfunction (MGD) score and qualities of cylindrical dandruff (CD) were also determined. Demodex mite infestations of eyelash samples were screened by both microscopic examination and semi-nested polymerase chain reaction (PCR)...
2017: International Journal of Ophthalmology
https://www.readbyqxmd.com/read/28091390/demodex-spp-infestation-associated-with-treatment-resistant-chalazia-and-folliculitis
#12
Ulviye Güvendi Akçınar, Emine Ünal, Metin Akpınar
Demodecidosis is an ectoparasitosis of pilosebaceous unit caused by demodex mites. The disease may be a primary skin disease or a secondary disease to inflammatory dermatoses such as folliculitis and rosacea. Demodex spp. blepharitis is an infectious ocular disease that is common but always neglected. These mites contain lipase enzymes that help carry bacteria on the surface. The infestation of Demodex spp. has increasingly become a public health concern. A 29-year-old male patient was admitted to our dermatology clinic with a complaint of papules and pustules on his face, which started 4 years ago...
December 2016: Türkiye Parazitolojii Dergisi
https://www.readbyqxmd.com/read/28063008/association-study-of-demodex-bacteria-and-facial-dermatoses-based-on-dgge-technique
#13
YaE Zhao, Fan Yang, RuiLing Wang, DongLing Niu, Xin Mu, Rui Yang, Li Hu
The role of bacteria is unclear in the facial skin lesions caused by Demodex. To shed some light on this issue, we conducted a case-control study comparing cases with facial dermatoses with controls with healthy skin using denaturing gradient gel electrophoresis (DGGE) technique. The bacterial diversity, composition, and principal component were analyzed for Demodex bacteria and the matched facial skin bacteria. The result of mite examination showed that all 33 cases were infected with Demodex folliculorum (D...
January 6, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28012607/do-demodex-mites-play-a-role-in-pterygium-development
#14
Witold Tarkowski, Joanna Moneta-Wielgoś, Daniel Młocicki
Numerous reports point to Demodex mites as the aetiology of certain eye and skin conditions, hence it is highly probable that infestation with these mites may also play a role in the aetiology and pathogenesis of pterygium. Therefore here we present a hypothesis: whether the presence of Demodex mites in eyelash hair follicles significantly correlates with the presence of pterygia, which could point to a potential role of these mites in the development of such lesions. We present preliminary data for supporting this hypothesis...
January 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/27976437/monitoring-structural-changes-in-demodex-mites-under-topical-ivermectin-in-rosacea-by-means-of-reflectance-confocal-microscopy-a-case-series
#15
LETTER
C Ruini, E Sattler, D Hartmann, M Reinholz, T Ruzicka, T von Braunmühl
No abstract text is available yet for this article.
December 15, 2016: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/27894366/evolution-of-host-range-in-the-follicle-mite-demodex-kutzeri
#16
Michael F Palopoli, VAN Tra, Kassey Matoin, Phuong D Mac
The sequences of four mitochondrial genes were determined for Demodex mites isolated from two distantly related species within the family Cervidae, and identified morphologically as belonging to the species Demodex kutzeri. The sequences were used to test the hypothesis that Demodex are strictly host-specific, and hence cospeciate with their hosts: (1) The estimated divergence time between mites found on elk vs humans agreed closely with a previous estimate of the time that these host species last shared a common ancestor, suggesting cospeciation of mites and hosts, at least over long evolutionary timescales...
November 29, 2016: Parasitology
https://www.readbyqxmd.com/read/27875092/morphological-variability-of-demodex-cati-in-a-feline-immunodeficiency-virus-positive-cat
#17
Elien R L Taffin, Stijn Casaert, Edwin Claerebout, Thomas J J Vandekerkhof, Sophie Vandenabeele
CASE DESCRIPTION A 17-year-old FIV-positive cat was evaluated because of weight loss during the preceding few months. The cat had a weight loss of 0.5 kg (1.1 lb) during the last month. Because of its FIV-positive status, the cat was confined indoors. CLINICAL FINDINGS A large nonpruritic area of alopecia with hyperpigmentation and comedones was present on the right lateral aspect of the neck. The chin had diffuse alopecia and comedones. Mild alopecia was present on the dorsal aspect of the muzzle. Trichography and microscopic examination of acetate tape imprint preparations and skin scrapings revealed a very morphologically heterogeneous population of Demodex mites...
December 1, 2016: Journal of the American Veterinary Medical Association
https://www.readbyqxmd.com/read/27802779/assessment-of-demodex-presence-in-acne-like-rash-associated-with-cetuximab
#18
Deniz Aksu Arıca, Turkan Ozturk Topcu, Leyla Baykal Selçuk, Savas Yaylı, Unzile Seyman, Evren Fidan, Sevgi Bahadır, Halil Kavgacı
CONTEXT: Cetuximab is an epidermal growth factor receptor inhibitor. It is frequently used in the treatment of solid tumors. However, it has a high potential to cause acne-like rash. Demodex mites, which are known to increase in number in immunosuppressive circumstances, are closely related to the acneiform lesions. OBJECTIVE: The aim of this study is to evaluate the presence of demodex mites in acne-like rash that appears under the treatment of Cetuximab. METHODS: We reviewed the medical records of patients who applied to our clinic with cetuximab induced papulopustular rashes between November 2014 and March 2016...
November 16, 2016: Cutaneous and Ocular Toxicology
https://www.readbyqxmd.com/read/27802314/detection-prevalence-and-phylogenetic-relationships-of-demodex-spp-and-further-skin-prostigmata-mites-acari-arachnida-in-wild-and-domestic-mammals
#19
Natalia Sastre, Olga Francino, Joseph N Curti, Tiffany C Armenta, Devaughn L Fraser, Rochelle M Kelly, Erin Hunt, Katja Silbermayr, Christine Zewe, Armand Sánchez, Lluís Ferrer
This study was conceived to detect skin mites in social mammals through real-time qPCR, and to estimate taxonomic Demodex and further Prostigmata mite relationships in different host species by comparing sequences from two genes: mitochondrial 16S rRNA and nuclear 18S rRNA. We determined the mite prevalence in the hair follicles of marmots (13%) and bats (17%). The high prevalence found in marmots and bats by sampling only one site on the body may indicate that mites are common inhabitants of their skin. Since we found three different mites (Neuchelacheles sp, Myobia sp and Penthaleus sp) in three bat species (Miotis yumanensis, Miotis californicus and Corynorhinus townsendii) and two different mites (both inferred to be members of the Prostigmata order) in one marmot species (Marmota flaviventris), we tentatively concluded that these skin mites 1) cannot be assigned to the same genus based only on a common host, and 2) seem to evolve according to the specific habitat and/or specific hair and sebaceous gland of the mammalian host...
2016: PloS One
https://www.readbyqxmd.com/read/27796564/parasites-and-vector-borne-diseases-in-client-owned-dogs-in-albania-infestation-with-arthropod-ectoparasites
#20
Enstela Shukullari, Dhimitër Rapti, Martin Visser, Kurt Pfister, Steffen Rehbein
To establish the diversity and seasonality of ectoparasite infestation in client-owned dogs in Albania, 602 dogs visiting four small animal clinics in Tirana from March 2010 to April 2011 inclusive were examined for ectoparasites by full body search and total body comb. In addition, ear swab specimens collected from all dogs and scrapings taken from skin lesions suspicious of mite infestation were examined for parasitic mites. Overall, 93 dogs (15.4 %, 95%CI 12.6-18.6) were demonstrated to be infested, and nine species of ectoparasites were identified: Ixodes ricinus, 0...
January 2017: Parasitology Research
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