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Demodex mite

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https://www.readbyqxmd.com/read/28761482/molecular-characterization-and-analysis-of-16s-ribosomal-dna-in-some-isolates-of-demodex-folicullorum
#1
Afrooz Daneshparvar, Gholamreza Mowlavi, Hamed Mirjalali, Homa Hajjaran, Iraj Mobedi, Saeed Reza Naddaf, Mohammadreza Shidfar, Mahsa Sadat Makki
BACKGROUND: Demodicosis is one of the most prevalent skin diseases resulting from infestation by Demodex mites. This parasite usually inhabits in follicular infundibulum or sebaceous duct and transmits through close contact with an infested host. METHODS: This study was carried from September 2014 to January 2016 at Tehran University of Medical Sciences, Tehran, Iran. DNA extraction and amplification of 16S ribosomal RNA was performed on four isolates, already obtained from four different patients and identified morphologically though clearing with 10% Potassium hydroxide (KOH) and microscopical examination...
April 2017: Iranian Journal of Parasitology
https://www.readbyqxmd.com/read/28747952/human-permanent-ectoparasites-recent-advances-on-biology-and-clinical-significance-of-demodex-mites-narrative-review-article
#2
REVIEW
Dorota Litwin, WenChieh Chen, Ewa Dzika, Joanna Korycińska
BACKGROUND: Demodex is a genus of mites living predominantly in mammalian pilosebaceous units. They are commonly detected in the skin of face, with increasing numbers in inflammatory lesions. Causation between Demodex mites and inflammatory diseases, such as rosacea, blepharitis, perioral and seborrhoeic dermatitis or chalazion, is controversially discussed. Clinical observations indicate a primary form of human Demodex infection. The aim of this review was to highlight the biological aspects of Demodex infestation and point out directions for the future research...
January 2017: Iranian Journal of Parasitology
https://www.readbyqxmd.com/read/28711190/role-of-demodex-mite-infestation-in-rosacea-a-systematic-review-and-meta-analysis
#3
Yin-Shuo Chang, Yu-Chen Huang
BACKGROUND: The reported prevalence and degrees of Demodex mite infestation in rosacea vary widely. OBJECTIVE: We sought to conduct an evidence-based meta-analysis of the prevalence and degrees of Demodex mite infestation in patients with rosacea. METHODS: Systematic literature review and meta-analysis were conducted. Odds ratios for prevalence of infestation and standardized mean difference (SMD) for Demodex density in patients with rosacea were pooled...
July 12, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28695830/prevalence-and-density-of-demodex-folliculorum-and-demodex-brevis-acari-demodicidae-in-erzincan-province
#4
Engin Tilki, Erhan Zeytun, Salih Doğan
OBJECTIVE: This study aimed to determine the prevalence and density of Demodex folliculorum and D. brevis in Erzincan Province and the association between Demodex spp. and skin moisture, pH, and temperature. METHODS: The study included total 300 healthy participants without dermatological ailments and residing in Erzincan Province. Moisture, pH, and temperature of the cheek were measured, and the presence of mite was determined in samples from the cheek, nasolabial, and chin region using the standard superficial skin biopsy technique...
June 2017: Türkiye Parazitolojii Dergisi
https://www.readbyqxmd.com/read/28653460/dual-anti-inflammatory-and-antiparasitic-action-of-topical-ivermectin-1-in-papulopustular-rosacea
#5
M Schaller, L Gonser, K Belge, C Braunsdorf, R Nordin, A Scheu, C Borelli
BACKGROUND: Recently, therapy of rosacea with inflammatory lesions (papulopustular) has improved substantially with the approval of topical ivermectin 1% cream. It is assumed to have a dual mode of action with anti-inflammatory capacities and anti-parasitic effect against Demodex, which however has not yet been demonstrated in vivo. AIM: To find scientific rationale for the dual anti-inflammatory and anti-parasitic mode of action of topical ivermectin 1% cream in patients with rosacea...
June 27, 2017: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/28583218/demodex-canis-regulates-cholinergic-system-mediated-immunosuppressive-pathways-in-canine-demodicosis
#6
P Kumari, R Nigam, A Singh, U P Nakade, A Sharma, S K Garg, S K Singh
Demodex canis infestation in dogs remains one of the main challenges in veterinary dermatology. The exact pathogenesis of canine demodicosis is unknown but an aberration in immune status is considered very significant. No studies have underpinned the nexus between induction of demodicosis and neural immunosuppressive pathways so far. We have evaluated the involvement of cholinergic pathways in association with cytokines regulation as an insight into the immuno-pathogenesis of canine demodicosis in the present study...
June 6, 2017: Parasitology
https://www.readbyqxmd.com/read/28552438/high-prevalence-of-demodex-spp-infestation-among-patients-with-posterior-blepharitis-correlation-with-age-and-cylindrical-dandruff
#7
D López-Ponce, F Zuazo, C Cartes, D Salinas-Toro, C Pérez-Valenzuela, F Valenzuela, L Traipe-Castro, R O López-Solís
OBJECTIVE: To determine prevalence of Demodex spp. and infestation index (II) by the parasite among patients of different ages with blepharitis and to assess association with occurrence of cylindrical dandruff (CC). MATERIALS AND METHODS: Prospective study including patients diagnosed with posterior blepharitis between 2013 and 2015, without previous acaricide treatment, was conducted by Fundación Oftalmológica Los Andes (Chile). Four eyelashes were randomly extracted from each eyelid for parasite detection...
May 25, 2017: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/28399378/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
#8
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. This new species is most similar to two other species occupying similar a 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 it differs in the following features: the terminal palpi are equipped with 3 spines, including 1 large claw-like spine and 1 single spine; 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 is equipped with large subterminal spur and proximal pointed projection; the opisthosoma is soft and flexible; and the male aedeagus has a different shape and localization...
August 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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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...
March 2017: Parasitology Research
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