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At least 1,315 records · Page 73Linked to original sources
PubMed1992

Parasitism of wild Gouldian finches (Erythrura gouldiae) by the air-sac mite Sternostoma tracheacolum.

Sixty-two percent of 26 wild caught Gouldian finches (Erythrura gouldiae) were infected with Sternostoma tracheacolum, a parasitic rhinonyssid mite. The intensity of infection was higher in adult finches than juveniles, and higher in juvenile females than juvenile males. Histopathological investigation of wild Gouldian Finches revealed bronchopneumonia and air sacculitis associated with mite infection. Although this mite may not have contributed to the decline of Gouldian finch populations in the wild during the past 20 yr, it may be suppressing the return of the finch to its former status.

Age Factors↗
PubMed1996

Antibody responses to Psoroptes sp. mites in Dall sheep (Ovis dalli).

We determined that antibody responses to Psoroptes sp. mites were not present in 403 of 407 sera samples collected opportunistically from 1979 through 1991 from Dall sheep (Ovis dalli) from five locations in Alaska, USA (Eastern Arctic, n = 61; Central Arctic, n = 15; Western Interior, n = 122; Central Interior, n = 63; Eastern Interior, n = 146). Test values for four samples exceeded the positive cutoff value for the immunoassay, but exposure to mites could not be confirmed since the 95% confidence interval for true prevalence ranged from 0 to 2.3%. Therefore, we concluded that these were probably false positive results. Our analysis, coupled with the lack of previous reports of mites or lesions in Dall sheep or other Alaskan ungulates, provided indirect evidence that Psoroptes sp. are not enzootic in Dall sheep in Alaska. In contrast, Psoroptes sp. have been reported in bighorn sheep (Ovis canadensis) and other wild ungulate populations from southern Canada to Mexico. These findings are compatible with the hypothesis that Psoroptes sp. were introduced into North America with imported domestic sheep and were not introduced by ancestral wild sheep.

Alaska↗
PubMed1999

An infestation of the mite Sancassania berlesei (Acari: Acaridae) in the external auditory canal of a Korean man.

We here report the case of a storage mite, Sancassania berlesei, infestation in the external auditory canal of a 46-yr-old male. He complained of feeling a foreign body and itching in the left external auditory canal for 1 mo, with accompanying otalgia for 3 days. Considering the duration of the patient's complaint and the 8-9-day life cycle of the mite, the mites are believed to have lived in the patient's ear for more than 3 generations.

Animals↗
PubMed1992

Immunization of rabbits with antigens from Psoroptes cuniculi, the rabbit scab mite.

Rabbits immunized with the whole body extract of Psoroptes cuniculi (Delafond, 1859) developed partial immunity to the infestation with this mite. These rabbits manifested P. cuniculi antigen-induced cell response and a high level of specific serum antibody after the immunization. Electrophoretic separation of the mite extract followed by immunostaining with various sera revealed differences between artificially immunized and naturally infested rabbits to most of the P. cuniculi antigens. However, the specific antibody pattern, that was developed by the immunized rabbits, was not changed after these rabbits were infested with the mites.

Animals↗
PubMed2005

Ornithonyssus (Acari: Macronyssidae) mite dermatitis in poultry field-workers in Almarg, Qalyobiya governorate.

Cutaneous manifestations of bird and rat mite infestation in man are not easily recognized by physicians or patients. Clinical signs and symptoms are developed secondary to bites of mites that have infested rats, domestic poultry or birds nesting in or near human habitation and comes into contact with man. This study details 4 cases of pruritic dermatitis developed in four field workers in poultry farms in Al-Marg district, Qalyobia governorate, Egypt. The zoonotic species of Ornithoyssus sp., (Family Macronyssidae) was isolated from all samples collected from patients' habitat and the role played by Ornithonyssus mites in causing dermatitis in man was discussed.

Acari↗
PubMed1987

The feeding behaviour of Psoroptes spp. mites on rabbits and sheep.

A scanning electron microscope (SEM) study of the mouthparts of Psoroptes cuniculi from rabbits and P. ovis from sheep established that they are identical in morphology and are adapted for surface feeding rather than piercing the epidermis. Haemoglobin was found in both P. cuniculi and P. ovis on rabbits but not in P. ovis on sheep and it is concluded that the haemoglobin is derived from small haemorrhages on the surface of inflamed rabbit skin. This inflammation is caused by the deposition of antigenic material on the skin which is abraded by the mite mouthparts. The mites feed on the resulting exudate and on other surface material. An immunofluorescent assay revealed that the 2 mite species are antigenically similar.

Animals↗
PubMed1988

Rat mite dermatitis.

Infestation by the tropical rat mite (Ornithonyssus bacoti) is presented with bizarre symptoms that made an accurate diagnosis difficult. The physical characteristics, life cycle, habits, and epidemiology of the tropical rat mite are discussed, as are the rat and other hosts, the rash produced by the mite, differential diagnosis of the dermatitis, and the treatment of the dermatitis and control of the infestation.

Aged↗
PubMed1987

Prevalence and host-parasite list of some nasal mites from birds (Acarina: Rhinonyssidae, Speleognathidae).

A survey of nasal mites, primarily from birds in Texas, was reported and comparisons with the other major studies were made. Of 103 host species examined, 40 were parasitized, and of 502 individual birds examined, 87 were parasitized (17% prevalence). It was shown that the prevalence of infection was significantly dependent on the bird taxa examined, which indicates that the evolution of the hosts has affected the nasal mites' ability to parasitize their avian hosts. It was also shown that the prevalence of rhinonyssid nasal mites in their hosts seems to differ significantly between geographic regions.

Animals↗
PubMed1986

Immediate type hypersensitivity in dogs induced by storage mites.

Results of intradermal skin tests on 53 dogs, employing storage mite extracts as antigen, indicated that storage mite allergy is fairly common. Only four of 29 dogs exhibiting no allergic symptoms showed skin reactions to the most common storage mite, Acarus siro, whereas 18 out of 24 dogs with symptoms assumed to be associated with allergy showed such reactions. The passive cutaneous transfer test revealed that an immediate type hypersensitivity reaction was involved.

Animals↗
PubMedDate not supplied

[Results of exposure to synthetic insect development inhibitors in Psoroptes cuniculi (Psoroptidae) mites].

Results of the effect of synthetic analogs of juvenile hormones of insects, dimiline, altozide and altozare, on the mite P. cuniculi have been shown. It has been noted that repeated coverings of mites in Petri dishes and rabbits' skin with 0.005--5% emulsions of altozide, 0.005--10% emulsions of altozare and 0.25--8% suspensions of dimiline cause no changes in their morphology and metamorphosis. 1--4% emulsions of altozide and altozare and 2--8% suspensions of dimiline have been found to have an acaricide effect and cause 100 per cent mortality of mites within 48 hours.

Animals↗
PubMed1995

Mites infesting commensal rodents in Shebin El Kom, Menoufia G., Egypt.

Rodent populations markedly increased in many Egyptian Governorates particularly commensal ones which live in close association with man and his domestic animals. In this paper, commensal rodents; M. musculus R. r. alexandrinus, and R. norvegicus were examined for the mites infesting them. Four species of mites were recovered; Ornithonyssus bacoti; Laelaps nuttalli, Dermanyssus gallinae and Allodermanyssus sanguineus. The medical and economic importance was discussed. It was concluded that mites and their environmental problem should be tackled.

Animals↗
PubMed1996

Immunohistopathological status of the skin in cases infested with three species of mites.

This study was performed on eighty patients with clinical manifestations of scabies. Sarcoptes scabiei adult or larva was isolated from 39 patients (48.8%). Dermanyssus gallinae (red poultry mite) and Dermatophagoides sp. were isolated from 6 and 5 patients respectively. Punch biopsies were taken from the patients, stained with haematoxylin and eosin and direct immunofluorescence stain to study the immunopathological status of the skin infested with three species of mites. The results declared that the pathological changes and the immunoglobulin deposition in the skin were nearly similar regardless of the type of the causative mite with the except of the presence of burrows in Sarcoptes scabiei.

Adolescent↗
PubMed1997

Efficacy of eprinomectin against mange mites in cattle.

OBJECTIVE: To determine whether eprinomectin was effective against mange caused by Chorioptes bovis and Sarcoptes bovis in cattle. ANIMALS: 80 cows naturally infested with C bovis and 30 cattle experimentally infested with S bovis. PROCEDURE: 6 trials were performed to determine efficacy against C bovis, and 2 trials were performed to determine efficacy against S bovis. In each trial, a group of untreated animals or of animals treated with vehicle alone was compared with a group of animals treated with a 0.5% formulation of eprinomectin applied topically (500 micrograms/kg). Number of mites in skin scrapings was determined prior to treatment and at weekly intervals for 8 weeks after treatment. Severity of skin lesions was evaluated when skin scrapings were obtained. In 5 trials, animals were weighed before and 56 days after treatment. RESULTS: Mite counts for treated cattle were significantly less than counts for control cattle from day 14 onwards in trials to determine efficacy against C bovis and from day 7 onwards in trials to determine efficacy against S bovis. Mites were not detected in scrapings collected from treated cattle on day 56. Mean weight gain of treated cattle was not significantly different from mean weight gain of control cattle in trials evaluating efficacy against C bovis but was significantly greater in trials evaluating efficacy against S bovis. CONCLUSION AND CLINICAL RELEVANCE: Eprinomectin was highly effective against C bovis and S bovis. Because eprinomectin can be administered to lactating cows, it may be useful for controlling mange in cattle.

Administration, Topical↗
PubMed1989

Familial background of respiratory atopy. A factor of type I allergy to house dust mite in patients with atopic dermatitis.

Skin prick and radioallergosorbent tests with the house dust mite were performed in 120 patients with atopic dermatitis. The results showed that about 60% of the patients had type I allergy to the mite. Results of the prick and radioallergosorbent tests did not relate to the severity of skin involvement, nor to the seasonal fluctuation of the disease. Positive skin and radioallergosorbent tests occurred in many patients with atopic dermatitis who had a personal or family history of respiratory atopy. However, both of these tests were negative in the majority of patients with "pure" atopic dermatitis who had neither a personal nor a family history of respiratory atopy. It was suggested that a familial background of respiratory atopy is an important factor for the development of type I allergy to the house dust mite in patients with atopic dermatitis.

Adolescent↗
PubMed1994

Immunobiology of the serine protease allergens from house dust mites.

Extracts of Dermatophagoides pteronyssinus and D. farinae were shown to contain a variety of 30 kDa serine proteases, including trypsin, chymotrypsin, and an elastase-like enzyme. The mite trypsin, unlike chymotrypsin and the elastase enzyme, was heterogeneous with regard to charge. The enzymes were shown to be present at higher concentration in fecally enriched extracts than in whole mite extracts. The proteases were shown to induce vascular permeability and to detach cells in tissue culture. Further study showed that the mite elastase induced non-IgE mediated rat mast cell degranulation. Such properties may contribute to immunogenicity.

Allergens↗
PubMed1993

Eosinophil cationic protein in the nasal secretions of patients with mite allergic rhinitis.

In 25 patients with mite nasal allergy and 13 healthy control subjects, levels of eosinophil cationic protein (ECP) and histamine in nasal secretions were examined before and after challenge with mite extract. The ECP level was found to be significantly higher in the washings taken 30 minutes after challenge compared with the washings taken before challenge (P < .05). ECP levels measured both before and after mite extract challenge were found to be significantly higher in the patients than in the controls (P < .01). These facts suggest that the ECP affects the nasal mucosa by causing injury to ciliated cells and by acceleration of the processes of modification and inhibition of the allergic reaction.

Adolescent↗
PubMed1994

High altitude climate therapy reduces peripheral blood T lymphocyte activation, eosinophilia, and bronchial obstruction in children with house-dust mite allergic asthma.

Asthma is a multifactorial disease of unknown etiology but often associated with atopy and inflammation. Previous studies in adult asthma have demonstrated the presence of activated T cells in blood, bronchoalveolar lavage (BAL) fluid, and bronchial tissue, and the relevance of their soluble products for eosinophil function. In view of these observations, it was hypothesized that similar pathogenetic mechanisms also occur in childhood asthma. In fact, peripheral blood T lymphocytes in 14 children with house-dust mite allergic asthma showed clear evidence of T cell activation as measured by the expression of CD25 and HLA-DR antigen. Without changing medication, significant reduction of the IL-2 receptor alpha-chain expression within the CD4+ lymphocyte population was observed after only 3 weeks of allergen avoidance. Within this time period, absolute and relative eosinophil numbers decreased to normal levels. After 5 weeks in an area of low house-dust mite exposure, lung function also presented evidence for clinical improvement of the asthmatic disease. These results indicate similar pathogenetic mechanisms in childhood and adult asthma. Furthermore, they suggest that allergen avoidance may contribute to the efficient therapy of asthma in patients with house-dust mite IgE-meditated allergy.

Adolescent↗
PubMed1994

Benzyl-benzoate foam: effects on mite allergens in mattress, serum and nasal secretory IgE to Dermatophagoides pteronyssinus, and bronchial hyperreactivity in children with allergic asthma.

Home mattresses of 24 asthmatic children with house dust mite allergy were sprayed with either benzyl-benzoate foam or placebo in a double blind fashion, 10 days before the children left the residential house for asthmatic children Istituto Pio XII (located in the Italian Alps in an environment free of mites) and went back to their own home for the Christmas and Easter holidays. A further group of 8 children, whose mattresses received no treatment, was kept as an absolute control. Two days after spraying, benzyl-benzoate or placebo were vacuumed from the mattresses. Acarex test was performed immediately before spraying and at the end of each holiday period of 20 and 10 days, respectively. Bronchial hyperreactivity as well as serum and nasal secretory specific IgE for Dermatophagoides pteronyssinus were assessed in all children immediately before leaving and within 48 hr after returning to the residential house. The results of the study show that sprayed benzyl-benzoate foam was no more effective than placebo in reducing the level of house dust mite recovered from patients' mattresses, or in reducing bronchial hyperreactivity and IgE concentration in serum and nasal secretions.

Adolescent↗