PubMed journal article Chronic exposure to pyrethroid-based allethrin and However, SGPT activity increased significantly in persons exposed to only allethrin. It has been concluded that mitochondrial apoptosis by allethrin could be an important factor in decreased male fertility . Similarly, allethrin. Chronic exposure to pyrethroid-based allethrin and prallethrin mosquito repellents alters .. activity of the enzyme SGPT (51%) in allethrin-exposed subjects.
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Sign up for email alert when new content gets added: Complicated case of scabies in a health care provider. Scabies is a highly contagious, neglected cutaneous parasitic disease, associated with poor individual, community, environmental circumstances and health. Hospital acquired scabies may occur due to contact between patients and sllethrin providers.
The non-classic presentation of scabies presents a challenging case to the clinician. A male healthcare provider presented with a dry, itchy rash on his lower legs which was non-responsive to initial chemotherapy, developing complicated hypersensitivity symptoms. Later skin biopsy and scrapings yielded Sarcoptes mites. During the first 2 weeks, the patient was dewormed at a health centre and later given intramuscular, oral and topical antihistamines a referral hospital with little improvement.
A final dose of ivermectin cleared the rash and itching. WE present a case of nosocomial atypical scabies in a healthcare worker which posed a rare challenge.
A complicated clinical history and previous medications appear to have masked the classic features.
Scabies is a parasitic dermatosis with a worldwide distribution. It is an itchy skin condition caused by the hypersensitivity reaction to products alleturin by the microscopic mite Sarcoptes scabei.
A number of various mite species are associated with the infestation of animal mange and human scab hosts, the dust or itch mites, comprising various species of Sarcoptes and Demodex, are most commonly associated with human scabies [ 1 ].
According to various studies, scabies due to the itch and dust mites affects up to million people annually worldwide and may cause large nosocomial outbreaks with considerable morbidity among patients and healthcare workers [ 2 ]. The clinical presentation includes pruritus and a variety of dermatological lesions ranging from papules, pustules, burrows, nodules, and wheals [ 3 ].
In epidermal parasitic diseases EPDhost-parasite interactions are restricted to the stratum corneum, the upper layer of the epidermis, where the ectoparasites complete their life-cycle, in part or entirely. Lesions are commonly found on the wrists, finger webs, antecubital fossae, axillae, areolae, periumbilical region, lower abdomen, genitals, and buttocks. Diagnosis is based on the history, physical examination, and demonstration of mites, eggs or scybala on microscopic examination [ 4 ].
The incubation period for scabies is about four to six weeks. The itch leads to frequent scratching, which may predispose the skin to secondary infections.
In its early stages, scabies may be mistaken for other skin conditions. Secondary bacterial skin infection, such as impetigo, are common complications [ 5 – 7 ]. Close skin contacts such as family members and sexual partners are the commonly mentioned modes of transmission. Spread of scabies to health care workers attending infected persons is rarely mentioned in the literature [ 89 ].
The classic burrowing rash and inter-digital pustules are a common finding in persons with poor hygiene standards or as with Norwegian scabies, lowered immune status [ 10 – 12 ]. Diagnoses are based on clinical history or risk and physical signs. Histopathology examination of skin biopsies remains the clinical gold standard [ 41314 ]. Other diagnostic tests include skin scrapings, dermatoscopic, intradermal skin tests, antigen-antibody detection and PCRbased diagnostics [ 15 – 18 ].
Prevention strategies ranging from quarantine [ 20 ], light and humidity modifiers [ 21 ] as well as mass drug administration [ 22 – 24 ] to endemic populations regardless of clinical presentation. Simple education on improvement of personal and community hygiene have all been tried, tested and proven effective [ 25 ]. A 34 year old, male healthcare provider presented at the referral dermatology clinic of Kilimanjaro Christian Medical Centre with persistent rash on his lower legs that was itchy especially at night Figure 1.
The initial dry rash was neither tunneling nor suppurative Figures 2A and 2B. The symptoms had been persistent for the past two weeks despite several applications of oral anti-histamines and topical steroids. The patient also received antihelminthes Albendazole treatment for possible intestinal worm infection, without relief. He reported a history of peptic ulcer disease and his memory of exposure to an infested patient was unreliable.
After a preliminary period of 5 weeks, he developed angioedema and a patchy erythematous rash and his family medical history was noncontributory. At early presentation a full heamogram and serology tests for liver and renal function were done after a cursory physical examination. The rash was restricted to his lower legs and unremarkable, while the heamogram was normal for red blood cell RBC indices but showed mild lymphocytosis with an acute eosinophilia.
The liver and renal function tests were normal with an elevated acute phase reactant, C-reactive protein CRP. A skin biopsy was taken from his right upper forearm for histopathology examination and later skin scrapings from some late expressing interdigital papules.
These both revealed scabies mites and scybala on examination Figures 3 and 4. Summary of major haematology and serology results pre- 2 weeks and post intervention after 4 weeks. Microscopic images of adult mites in skin scrapings 10 weeks mounted in KOH: During the first 7 days of symptom presentation, the patient was de-wormed with mg Albendazole for 3 days.
As this provided no relief, he was referred to the dermatology clinic a week later, where based on his initial laboratory results, he was administered Benzyl Penicillin 2.
He was also started on triple therapy for H. Scabies remains a neglected tropical disease of poverty despite the large number of cases reported per year, and the millions more at risk in tropical countries. The definitive diagnosis of a typical early case of scabies is usually a result of high index of suspicion during clinical examination, with a support of microscopic examination of skin biopsies or scrapings [ 1418 ].
Both clinical skills and diagnostic tools are rarely available at primary health care levels resulting in institutional outbreaks of scabies. It is estimated that by the time a case is positively identified, no less than 3 healthcare workers in a typical tertiary health centre have been sufficiently exposed for effective transmission of mites [ 6920 ].
This factor alone makes the effective control of scabies particularly difficult [ 4132627 ].
A complicated case of scabies in a health care provider
Although nosocomial scabies is perceived to be of rare occurrence, a high-risk index and history of exposure are leading indicators of suspicion, while the typical dermatological pattern with a persistent nocturnal itch justify a confirmatory examination [ 14egpt ]. Where scabies presents atypically, it is often challenging to definitively diagnose sgptt case based on the early symptoms [ 1428 ].
This patient presented at least two weeks after onset of symptoms, which typically occur weeks after exposure.
The initial pattern and presentation of the rash was atypical, compounded by an unreliable recall of contact risk and a history of gastric ulcers. The initial management targeted towards a possible H. In cases involving single allethrin of a healthy egpt with sufficient personal hygiene, the infesting dose of mites may survive and reproduce for up to 45 days before presenting symptoms abate [ 426 ].
The patient was seronegative for any immune-compromising diseases and had no alletnrin thereof. Although the skin scrapings and biopsy eventually showed the presence of sarcoptes mites and scybala in the stratum corneum, this was a rather late discovery. The classical interdigital pustules appeared towards the end of the 9th week, after the patient had been started on oral ivermectin. Preliminary laboratory tests remained insufficient for a conclusive early diagnosis [ 1417 ].
D-Allethrin | C19H26O3 – PubChem
The cost in time, resources and various interventions during this period are no doubt significant and address a key concern associated with NTDs [ 61418 ]. The preventative measure of cleaning out his wardrobe and beddings plus housing may have provided crucial disruption of a self-re-infection cycle [ 611 – 13 ]. Although the eventual responsive treatment supported by the microscopy findings strongly suggest a case of scabies, the preliminary diagnosis of dermatosis due to peptic ulcer disease was equally supported by a positive ELISA as well as a sustained allethrib of serum CRP and marked eosinophilia.
Allsthrin case proved particularly challenging and confirmatory diagnosis was only achieved towards convalescence. It is enlightening as a possible differential for healthcare workers with atypical presentation of nosocomial scabies. A complicated case presentation may have masked the clinical picture and delayed early suspicion and management of scabies.
Written informed consent was obtained from the patient for publication of this case study and any accompanying images. A complicated case of scabies in a health care provider.
Rash as seen on at presentation; B.