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PubMedDate not supplied

[The action of insect developmental regulators on the housedust mites Dermatophagoides pteronyssinus (Trouessart, 1897) and D. farinae Hughes, 1961 (Acari: Pyroglyphidae)].

Whether insect growth regulators, such as methoprene, telflubenzuron and flufenoxuron, can be used to suppress the populations of the house dust mites D. pteronyssinus and D. farinae has been studied in the laboratory setting. The most potent agent has been found to be methoprene used in concentrations of 0.05 = 0.1%, in particular. Flufenoxuron at a concentration of < 0.1% has been shown to stimulate the reproduction of house dust mites.

Animals↗
PubMed1995

[Fauna and biology of the Pyroglyphidae of Poland].

5 valid species of pyroglyphid mites are actually known in Polish fauna. It should be stressed that the knowledge of their occurrence in house-dust, bird nests and other habitats is still poor. The most common pyroglyphid house-dust mites, Dermatophagoides pteronyssinus, D. farinae and Euroglyphus maynei, were found in samples of dust from houses (Warszawa, Bydgoszcz, Upper Silesia), hospitals (Katowice, Sosnowiec), libraries (Sosnowiec) and port buildings (Gdynia). The both species of the genus Dermatophagoides were also found in house-dust samples in Poznań and Poznań vicinity, whereas E. maynei and D. pteronyssinus--occasionally in stored herbs in Grudziadz. Moreover, Gymnoglyphus longior was reported from house-dust (Tarnowskie Góry, Upper Silesia), debris from a byre in Lesko and from barn litter in Solarnia near Lubliniec, while Hirstia passericola was found in byre debris in Lesko. It seems that D. pteronyssinus and D. farinae are common in house-dust all over the country. The following pyroglyphid mite species--D. pteronyssinus, H. passericola, G. longior--are reported from nests of birds in Poland.

Animals↗
PubMed1989

Pyroglyphid mites in the High Tatras sanatoria.

1. In our work we studied the problematics of house dust fauna in the sanatoria and institutes of the Tatra region, regarding especially the incidence of mites of the family Pyroglyphidae that are considered for the major source of house dust allergen. 2. In eleven places of different altitude in this region, there were in 1982 chosen 13 localities--sanatoria and institutes. Here, once quarterly, were collected house dust samples from beds and floors. 3. In the Locality 1 Helios, Strbské Pleso, the house dust samples were collected in 1976, once in two months, in 1979 once in three months, and in 1982 once quarterly. Here, the involvement of the new--opened sanatorium by house dust mites was studied. 4. House dust samples in the studied localities were collected using the electric vacuum cleaner into the changeable paper bags. The samples were examined by flotation due to Spieksma (1970) and due to the modification of Spieksma's methodics elaborated by Samsinák et al. (1974). 5. The found house dust mites--pyroglyphids were evaluated due to Bronswijk and Sinha (1971) and due to the modification of their methodics elaborated by Samsinák et al. (1974). The classification due to Wharton (1976) was used as well. 6. In every studied locality, in house dust collected from floors and beds, there were identified mites of the family Pyroglyphidae, considered for the major source of house dust allergen. 7. Mites of the family Pyroglyphidae were represented by the genera Dermatophagoides and Euroglyphus, and by the species Dermatophagoides pteronyssinus, Dermatophagoides farinae, and Euroglyphus maynei. There were found as well the nymphal instars of the genus Dermatophagoides, in this development degree it is very complicated to determine precisely the species--and that is why the term Dermatophagoides sp. nymphal instar is used. 8. In 1982 there were in the chosen localities collected 764 house dust samples from beds and 20 samples from floors, 186 of them (23.7%) were negative--without any mites. In the positive samples there were identified 1794 arthropods, 1776 were mites and 18 were Psocopterae. Of the total mite number 1263 (71.1%) were mites of the family Pyroglyphidae. 9. The other mite families were represented by 513 pieces, i.e. 28.6% of the total arthropod number. 10. In the studied localities there were identified three species of the family Pyroglyphidae and 15 species of other families, the representatives of the families Ereinaetidae, Tetranychidae (not determined preciselier), and Oribatei.(ABSTRACT TRUNCATED AT 400 WORDS)

Animals↗
PubMedDate not supplied

[Acarofauna of house dust in Barcelona and surrounding cities].

The study of the house-dust acarofauna has aroused great interest since Voorhorst and colls. (41), in 1964, showed the continual presence of Dermatophagoides pteronyssinus in this habitat; and considered by these authors to be mainly responsible for the allergenic capacity of housedust. Studies carried out by other authors around the world confirm the universal character of this acarus and its prevailing presence in house-dust biocenosis. Dermatophagoides pteronyssinus is usually accompanied with other species of the same Pyroglyphidae family (see table II and III), and by species belonging to other acarian families and groups (table I). In this work 182 house-dust samples have been analyzed; these samples were collected in Barcelona and its surrounding. All have been found to be positive to acari. Samples of 5 g of house-dust were used for the study. The number of acari present in each sample showed a great variation both in relation to the total of acari present and to the number of isolated Pyroglyphidae (table VII and VIII). Dermatophagoides pteronyssinus appeared to be the prevailing species, found in 175 of the 182 samples examined and representing 39.70% of the total population of the acari collected. Other Pyroglyphidae isolated were D. farinae (95 samples), Euroglyphus maynei (75 samples), D. microceras (19 samples), D. passericola (1 sample) and Malayoglyphus carmelitus (1 sample) (table VI). The frequency and density in which other species of acari appeared in house-dust samples studied are shown in table VII. If we compare our results with those obtained by others (1, 7, 11, 21, 23, 26, 28, 29, 38) we see a great difference according to the frequency of acarian infestation in house-dust. We think that the causes of this variation are the diverse methods and techniques employed in the isolation and enumeration of acari. The low infestation percentages given by some authors could be due to the following: a) a study of insufficient amounts of house-dust samples; b) the lack of a method used for processing the samples; c) the interaction of both factors. The discovery of three single D. passericola specimens found in one sample lets us assume that the pressence of this acarus in house-dust has been sporadic. We think it could originate from birds' feathers or nests. Despite the very high number of Tarsonemus sp. collected (37.17% of the acari total) the representative of this species is actually very low, since almost all of them were found in two different samples taken from the same house.

Acari↗
PubMed2005

Molecular identification of pathogenic house dust mites using 12S rRNA sequences.

House dust mites are microarthropods implicated in the cause of allergic diseases. Currently, there is no phylogenetic analysis of dust mites based on genomic or mitochondrial DNA (mtDNA) evidence. For the first time, we report evolutionary relationships based on partial mtDNA 12S rRNA sequences among the four dust mite families Pyroglyphidae (Dermatophagoides pteronyssinus), Glycyphagoidea (Glycyphagus privatus), Acaridae (Aleuroglyphus ovatus), and Echimyopodidae (Blomia tropicalis). Thirteen sequence variants were obtained and phylogenetic analysis showed two monophyletic clades composed of two species each. Contrary to current taxonomic classification, the Acaridae clustered in a monophyletic group with the Pyroglyphidae. Considering the current difficulties in identifying these medically important species for the purpose of eradication and treatment, it is significant that sequence data are capable of discriminating between species belonging to different families of dust mites.

Acaridae↗
PubMed2003

[Acarofauna in the apartments of patients with perennial atopic rhinitis and functional tests of the respiratory system].

Prolonged exposure to house dust mites (HDM) of the Pyroglyphidae family leads to the development of perennial allergic rhinitis (PAR) in sensitized subjects. In PAR patients bronchial hyperreactivity--the clinical manifestation of allergic inflammation in the lower airways is often observed. The aim of the study was to estimate the influence of the exposure to HDM in PAR patients on selected functional parameters of the lower airways. The study was performed on 64 patients with PAR caused by allergy to HDM (Dermatophagoides pteronyssinus, Dermatophagoides farinae) without either symptoms of asthma or spirometry abnormalities. The lower airways function was estimated by bronchial histamine provocation test (BHR) and flow-volume spirometry. The house dust mite quantity was measured in dust samples collected in spring and autumn. One sample was assessed by flotation technique with the use of methylene chloride and the mites species were identified (direct method) and the other sample was used to perform the Acarex test (semiquantitative guanine determination test). Positive result of Acarex test was obtained in spring in 72% houses and in autumn in 63%. The predominance of the Pyroglyphidae family was observed in PAR patients' houses. The study showed that the exposure to the allergenic HDM in the quantity higher than 0.6 mg guanine/g dust in autumn implies the increased incidence of both bronchial hyperreactivity and decreased airflow in the small bronchi in control spirometry tests. A strict correlation between the quantity of mites in houses in spring and autumn measured by the direct (flotation method) and the indirect (Acarex) tests was observed. Both methods proved to be equivalent in detecting allergens of house dust mites.

Adult↗
PubMedDate not supplied

[Factors influencing the house dust mite population IV. Altitude].

A study has been carried out on house-dust mites present in the buildings of 3 towns in Catalunya (Spain), with different altitudes: Reus (altitude, 76 m); L'Ametlla (altitude, 321 m); and Puigcerdá (altitude, 1.202 m). The period studied was between october, 1975 and september 1976. From this study, a negative correlation has been observed between the number of mites in house dust and the altitude of the town. This supports the results obtained by other authors. The decrease in the number of mites with increases in altitude is due to a decrease in the number of mites belonging to the Pyroglyphidae family. This family was present in all samples of house-dust studied, and generally in a greater number than other groups of mites. Of the three species of Pyroglyphidae more frequently present in house dust (Dermatophagoides pteronyssinus, D. farinae and Euroglyphus maynei), D. pternyssinus was the most abundant as well as the most affected variations of R.H and temperature resulting from the variations of the altitude. D. farinae and E. maynei were found in low levels suggesting inadequate conditions of temperature and R.H. in the houses studied. Even if E. maynei was the most abundant species in Puigcerdá, this is due more to the decreased incidence of D. pteronyssinus than to an increase in the number of E. maynei.

Altitude↗
PubMedDate not supplied

Mite allergy in the tropics: sensitization to six domestic mite species in Cartagena, Colombia.

Sensitization to the domestic mites Blomia tropicalis, Chortoglyphus arcuatus, Lepidoglyphus destructor and Aleuroglyphus ovatus was investigated in 77 subjects with clinical symptoms of asthma and/or allergic rhinitis and a positive skin prick test (wheal > or = 3 mm) to Dermatophagoides pteronyssinus and/or D. farinae. Seventy patients were skin test-positive to D. pteronyssinus and 73 to D. farinae. Serum samples from 29 nonallergic, skin test-negative individuals were used as negative controls. Specific IgE was determined by RAST and the results expressed as the % of the total counts bound (% TCB). A positive result (> or = 1% TCB) to D. farinae was detected in 89.6% of subjects, to B. tropicalis in 80.5%, to D. pteronyssinus in 75.3%, to C. arcuatus in 71.4%, to A. ovatus in 68.8% and to L. destructor in 59.7%. None of the controls had a positive RAST to any of the mite species. Different IgE binding patterns were observed among these subjects, suggesting sensitization to unique as well as common allergens in the different mite species. Sensitization to Pyroglyphidae (D. pteronyssinus and D. farinae) and non-Pyroglyphidae mites (B. tropicalis, C. arcuatus, L. destructor and A. ovatus) is common among allergic individuals in Cartagena. Extracts of these mites may be needed for a more accurate diagnosis and effective treatment of respiratory diseases due to mite allergy in tropical environments.

Adult↗
PubMedDate not supplied

Extracts from various mite species contain cross-reactive and noncross-reactive IgE epitopes. A RAST inhibition study.

Previous studies have demonstrated the high incidence of Dermatophagoides, Euroglyphus, Blomia, Lepidoglyphus and Chortoglyphus spp. sensitizations in a mite-allergic population. The aim of this study was to evaluate immunological cross-reactivity among the above mentioned groups, using sera from a nonrural population allergic to mites, from a subtropical area (Canary Islands). RAST inhibition studies demonstrated significant cross-reactivity among Dermatophagoides and Euroglyphus species (> or = 65% of maximum theoretical inhibition), as also noted by other authors. Blomia kulagini demonstrated scarce cross-reactivity with Dermatophagoides, Lepidoglyphus and Chortoglyphus species (< or = 30% of maximum theoretical inhibition) and medium level with Euroglyphus maynei (45% of maximum theoretical inhibition). Chortoglyphus arquatus demonstrated high cross-reactivity levels with the other species studied. The results obtained in this study demonstrated the scarce immunological cross-reactivity between Pyroglyphidae and non-Pyroglyphidae mites, thus suggesting the polysensitization of the studied population to different mite species.

Adolescent↗
PubMed2003

Comparison of house dust mites found on different mattress surfaces.

BACKGROUND: House dust mites have been considered the most important source of allergens for humans. These allergens have been encountered at different indoor sites, mainly on mattresses and pillows. OBJECTIVE: To evaluate the number and different specimens of mites on Brazilian bunk-bed mattresses. METHODS: Dust samples were collected once using a standardized method on the upper mattress surface (US) and lower mattress surface (LS) (bed frame also included in the latter) of 58 mattresses. RESULTS: The total number of mite bodies on the LS was 3.5-fold higher than on the US, with a mean concentration of 932 mites per gram of fine dust (mites/g) on the US (range, 0-3,375 mites/g) and 3,254 mites/g on the LS (range, 125-14,500 mites/g) (P < .001). Additionally, the number of house dust mite bodies on the LS was 2.4 higher than on the US (P < .001); the mean concentration was 750 mites/g on the US (range, 0-2,875 mites/g) and 1,816 mites/g on the LS (range, 0-10,875 mites/g). Approximately 91% (n = 52) of the US and all LS dust samples had more than the limit of 100 mites/g. The most frequent family was Pyroglyphidae in both mattress surfaces, with Dermatophagoides pteronyssinus the most important species found. Storage mites, including Glycyphagidae (P < .001), Acaridae (P < .001), and other families (P < .001), also showed significant differences in the number of mites between both sample counts. CONCLUSIONS: This study shows a significant difference in US and LS mite counts, with higher counts on the LS. Mite allergen avoidance should include the LS and bed frame as potential targets.

Air Pollution, Indoor↗
PubMed2006

House dust mite fauna in western Anatolia, Turkey.

House dust mites play an important role in the pathogenesis of allergic diseases. Many factors may influence mite growth. The presence of mites is related to mean temperature and humidity as well as altitude. The aim of this study was to analyze the mite fauna in 5 regions of western Anatolia, Turkey, that have similar climatic properties with low mean temperature and humidity, but differ in altitude. During the period October-November 2004, house dust was collected from 290 homes in 5 different cities. House dust mites were isolated in 67 (23.1%) of 290 samples. The family Pyroglyphidae (Astigmata) was present in all positive samples. This study suggests that the selected western Anatolian regions that share similar environmental conditions host similar dust mite populations.

Animals↗