Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 19

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  wektory bakterii
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
Borrelia burgdorferi sensu lato (s. I.), the etiological agent of Lyme diesease, is transmitted by the bite of Ixodes ricinus. During May and September 1999, field surveys on Lyme disease spirochetes were conducted in three locations of a region of north-west Poland, known as recreational districts visited by many people. The ticks Ixodes ricinus were collected in natural habitats by dragging a flanel cloth over the vegetation. Sex and developmental stage of each tick were determined. Based on a polymerase chain reaction test with primers that recognize a chromosomal gene of all strains, out of the total 1414 specimens collected, 126 (8.9%) were found to be infected. the species B. burgdorferi s. 1. comprises at least three pathogenic genomospecies, B. burgdorferi sensu stricto (s. s.), Borrelia garinii, and Borerelia afzelii, witch could be distinguished in nested-PCR tests with species-specific primers. B. burgdorferi s. s. was most prevalent (96% of infected ticks), followed by B. garinii (1.3%), and B. afzelii. was not found. Of the infected ticks, over the 99% were infected with a single species; one specimens was infected with two species. For 4 ticks, the infecting species could not be identied. The difference in rates of prevalence was observed among the tree locations (17%-5.3%-3.2%).
8
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

Kleszcze - nie tylko borelioza

67%
Honey bees are very important insects for human food production. More than one-third of the food consumed by humans is pollinated by honey bees, including much of it fruits and vegetables. Numerous suspects have been identified in the hunt for a cause of CCD (Colony Collapse Disorder), from nutritional deficiencies, viral, Nosema ceranae and parasitic to exposure to genetically modified plants or pesticides (isonicotinoids). It has also been suggested that CCD may be due to a combination of many factors and that no single factor is the cause. CCD is a phenomenon in which worker bees from a colony abruptly disappear. A significant Varroa destructor mite infestation leads to suppression of humoral and cellular immune responses of the honeybee. Therefore, it may be a major contributing factor to CCD. Moreover, V. destructor, an external parasitic mite that attacks honey bees by sucking hemolymph, spreads Israeli acute bee paralysis virus (IABPV) to bees, as well as Kashmir bee virus (KBV) and deformed wing virus (DWV), entomopathogenic bacteria and parasites.
The maintenance of Borrelia burgdorferi s.1. in the environment is dependent on the zoonotic cycle involving tick vectors and certain reservoir hosts. It is well known, that the same species of wild rodents, as well as the vector Ixodes ricinus, are often co-infected with at least two genomospecies of B. burgdorferi s.1.: B. afzelii and B. garinii. The ticks collected from two rodent species: Clethrionomys glareolus and Apodemus flavicollis were examined for the presence of B. burgdorferi s.1., as well as for B. garinii and B. afzelii. In this study, an immunofluorescent antibody assay (lFA) and polymerase chain reaction (PCR) protocols were used. The high level of infestation in rodents (90% for C. glareolus and nearly 100% for A. flavicollis) shows that wild rodents are important hosts of the immature stages of I. ricinus. A high percent of Borrelia positive ticks collected from bank voles and yellow necked mice; above 7% determined by 1FA and 2% determined by PCR, elearly revealed that these species of animals are competent zoonotic reservoirs of B. burgdorferi s.l.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 1 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.