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Estimation of distribution parameters of some avian parasites

100%

Lonc E., Okulewicz A., Kopocinska I.

Wiadomości Parazytologiczne

1997

tom 43

nr 2

Occurrence of nematodes (mostly dominating and common species of Porrocaecum ensicaudatum and P. semiteres) in host populations of birds (Turdus merula, T. philomelos, Sturnus vulgaris and Scolopax rusticola) was summarized in frequency distributions, and tests of agreement with the Poisson model as well as the modified binomial have been computed. Comparisons of the observed frequencies with the expected ones showed the high values (3 - 257) of the coefficient of dispersion, the so-called „overdispersion", characteristic for the negative binomial which is an extension of the Poisson model. A nearly perfect fitness of the counted (observed) with the expected frequencies was found for S. vulgaris both in the analysis of nematode metapopulation and their common species of P. ensicaudatum. Some deviations from the expectations were found for tracing of all nematode species distributions in T. merula, T. philomelos. On the other hand, the same model (negative binomial distribution according to moment method) has fitted quite well to each for common or dominating, nematode species.

Increasing frequency of cercarial dermatitis at higher latitudes

100%

Larsen A. H., Bresciani J., Buchmann K.

Acta Parasitologica

2004

tom 49

nr 3

The number of cercarial dermatitis (swimmer’s itch) cases in the Nordic countries has been increasing during the latest years. Thus, records from Iceland, Norway, Sweden and Denmark have occurred at increasing frequencies. In order to elucidate the biological basis for this infection of ten species of pulmonate snails in some Danish lakes were monitored in 2003. Ocellate cercariae belonging to the genera Trichobilharzia and Bilharziella were recorded in 1.3% and 0.71% of all snails examined, respectively. However, in specific snail hosts the prevalences recorded were up to 50%. The biotic and abiotic factors responsible for the observations are discussed, but the relatively high prevalence of infected snails in the present study calls for further monitoring of these pathogenic cercariae in European freshwater localities.

Allergy to pigeon tick [Argas reflexus] in Upper Silesia, Poland

67%

Spiewak R., Lundberg M., Johansson S. G. O., Buczek A.

Annals of Agricultural and Environmental Medicine

2006

tom 13

nr 1

The pigeon tick Argas reflexus is avian ectoparasite that typically feeds on pigeons. When devoid of a natural host, the ticks can also attack humans. In Upper Silesia, southern Poland, people living in the vicinity of the birds’ nesting sites are frequently bitten by A. reflexus. The bites can provoke serious allergic reactions, including fatal anaphylactic shock. In the present study, residents of 9 apartments invaded by pigeon ticks were invited to undergo medical examination, skin prick tests (SPT) and determination of specific IgE to A. reflexus. The test allergens were prepared of ticks collected on-site. Out of 18 residents living in the infested apartments, 15 accepted the invitation. In this group, 8 persons complained of tick-related health problems, positive SPT to A. reflexus were found in all of them, and specific IgE was detectable in 3 persons (range: 0.38–0.84 kUA/l; CAP class 1–2). Final clinical diagnoses were established of generalised urticaria with asthma in 1 person, generalised urticaria in another 1, and local allergic reactions to tick bites in the remaining 6. Among 7 symptom-free residents, all test results were negative. Besides the study group, the paper also describes the case of a person who developed hypersensitivity to A. reflexus as a child, after a few visits to an abandoned dovecote. 30 years later, positive SPT (++) and specific IgE (0.78 kUA/l; CAP class 2) were still present despite no further re-exposures. The article also discusses available pest control measures against A. reflexus.

Ograniczanie wyników

1 Acta Parasitologica

1 Annals of Agricultural and Environmental Medicine

1 Wiadomości Parazytologiczne

1 Bresciani J.

1 Buchmann K.

1 Buczek A.

1 Johansson S. G. O.

1 Kopocinska I.

1 Larsen A. H.

1 Lonc E.

1 Lundberg M.

1 Okulewicz A.

1 Spiewak R.

1 2006

1 2004

1 1997

Wyniki wyszukiwania

Estimation of distribution parameters of some avian parasites

Increasing frequency of cercarial dermatitis at higher latitudes

Allergy to pigeon tick [Argas reflexus] in Upper Silesia, Poland