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The paper presents the epidemiological situation of rabies in Poland in the period of 2011-2015, as well as discusses the effectiveness and costs of a national campaign of oral immunization of free-living foxes that has been carried out since 2002. It also evaluates the impact of the preventive measures on the dynamics of the number of foxes. During the study period, a decrease in the number of confirmed rabies cases in wild and domestic animals was recorded, but the primary reservoir of the virus continued to be free-living foxes. The high effectiveness of vaccination, evaluated by detailed laboratory tests, contributed significantly to the level of foxes immunization, which was also confirmed by ecological assessment. However, in some voivodeships and in some years of the study, the level of immunization was mediocre, as demonstrated by the results from 2015, when only every second fox examined had acquired resistance as a result of preventive vaccination. Despite the relatively high cost of these preventive measures, which include the cost of the vaccine and its distribution in the field, it seems necessary to continue the oral immunization of foxes, initiated in 1993 and expanded throughout the country in 2002. The dramatic decrease in the incidence of rabies in animals directly reduces epidemiological risks. Undoubtedly, a negative aspect of the aforementioned campaign is a persistently large and growing population of foxes and its adverse impact on the functioning of the main small animal species, as well as the possibility of an increased epizootic risk of other diseases affecting foxes. In this situation, it seems necessary to intensify the culling of foxes.
The publication presents the results of monitoring Q fever in the Wielkopolska Voivodeship and three outbreaks disclosed as part of a clinical field practice. In five years (2011–2015) of examination in the Wielkopolska Voivodeship, 2,431 serological tests were carried out (1,851 in sheep, 343 in goats and 237 in cattle). Antibodies against Coxiella burneti were found three times. The first positive result in 2011 affected herds of goats and cattle and was confirmed in the reference laboratory of the National Veterinary Research Institute in Pulawy. A specific DNA sequence for Coxiella burneti by real-time PCR method was found. The farm consisted of 1,494 goats and 397 cattle. Serological tests were carried out to give positive results in 15.3% of the cattle and 5.77% of the goats from the whole herd. Breeding selection and the elimination of seropositive animals and double oxytetracycline treatment reduced the proportion of animals with a positive result to 5.53% in cattle and 0.96% in goats. After more than a year the elimination of seropositive animals and probable natural decline in antibody levels has led to the recognition of an outbreak of Q fever to be eliminated. The second positive result of the monitoring of Q fever was found in 2014 in one cow out of seven respondents, but the serological test was not confirmed in the reference, as a specific DNA sequence for Coxiella burneti was not found. The research conducted in sheep in 2015 showed the presence of antibodies against Coxiella burneti in two samples. The results were confirmed by the detection of genetic material of the pathogen by real-time PCR examination in the National Veterinary Research Institute in Pulawy. Three outbreaks of Q fever revealed in clinical practice related to bovine herds where clinical disturbances were observed in: reproduction, milk production decrease or increase in internal body temperature and symptoms of the respiratory system. The positive ELISA test results were the reason for the elimination of seropositive animals. Moreover, after the disclosure of infection two herds were vaccinated using an inactivated vaccine Coxevac (CEVA), which caused the improvement of production results and relief of clinical symptoms. It is worth mentioning that in two farms along with cattle there were fallow deer supported by staff cowman. Official monitoring tests of Q fever revealed an outbreak of the disease in a herd of goats and cattle, which lead to taking effective action to protect public health because of the zoonotic nature of this infection and epidemiological risk. In the disclosure of these clinical signs in cattle it is advisable to carry out laboratory tests for Q fever.
The aim of study was to evaluate the epizootic situation of rabies in Poland in 2011-2015 in relation to the free-living population of foxes, which are the main vectors of the rabies virus. The number of rabies cases increased in the first two years of this period, but subsequently diminished. The primary reservoir of the virus are still free-living foxes and, among domestic animals, dogs and cats. In terms of the frequency of virus occurrence in Poland, a shift has been noted in recent years from Podkarpackie Voivodeship to Lesser Poland Voivodeship. In 2015, over 80% of all rabies cases were diagnosed in Lesser Poland, and in domestic animals the virus was diagnosed solely in this voivodeship. During the study period, the population of free-living foxes was stable, but there was a slight increase in the number of foxes hunted. Nevertheless, the hunting index for the fox population, which does not exceed 72%, suggests that hunting is currently not the only mortality factor among foxes. The analysis of the size and density of the fox population in particular voivodeships revealed that density is not the main determinant of the occurrence and spread of the virus. The results of the study confirm that the immunization of free-living foxes, although costly, is still necessary to improve the situation, especially in regions with a high prevalence of the virus.
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