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EN
Bluetongue (BT) is an infectious, non-contagious disease of animals, especially domestic animals and wild ruminants. BT is considered endemic in wildlife in large parts of Africa and North America. Most species of wild ruminants are susceptible to BTV infection, though frequently asymptomatically. The pathogenicity of BT among wildlife ranges from asymptomatic to fatal. Wild sheep, such as as bighorn and mouflon, are susceptible to BTV infection and can develop fatal clinical disease just like domestic sheep. Clinical disease also results from experimental or natural infection of antelope, wapiti, musk, ox, bison, yak, white-tailed deer and African buffalo, whereas blesbock, mountain gazelle, roe deer, red deer and Eurasian elk do not show clinical signs after natural or experimental infection, which can only be recognized by the presence of BTV-specific antibodies or viral RNA. Some camelids are also reportedly susceptible to BTV infection. A severe clinical form of this lethal disease has been reported in naturally infected llamas, whereas an experimental infection of llamas induced antibodies against BTV, but no clinical signs were observed. No clinical signs of BT have been observed in experimentally infected dromedary camels, but all animals seroconverted, and RNA BTV was isolated from the blood during viraemia, which suggests that camels may act as a reservoir for BTV and play an important role in its transmission. Wild animals, particularly cervids (because of their wide distribution in Europe), could be used as sentinels for the surveillance of BTV.
EN
The taxonomy and properties of type E hepatitis virus (HEV) classified to genus Hepevirus, family Hepeviridae, have been described. Genotypes I, II, III and IV have been distinguished. The disease occurs in humans mainly in developing countries. However, during recent years it has been diagnosed in industrialized countries, such as Japan, USA and European countries, as well, even without earlier contact of people with a population living in the Third World areas. Contacts of people with pigs, resulting in type E hepatitis or specific seroconvertion indicate that these animals are the reservoir of HEV. Particularly genotypes III and IV, which occur in swine, participate in such cases in the etiology of type E hepatitis in humans. This finding indicates that type E hepatitis in humans is, at least in several circumstances, a zoonotic disease. Beside swine, which are the main source of the virus, other species, such as ruminants, rodents, and poultry, are also carriers of the mentioned genotypes III and IV. The infection takes place by the oroenteral route, which is the only way of spreading the infection and disease. The virus excreted with the feces contaminates the environment. Independently from other pathogens, hepatitis in swine can be caused by the mentioned virus; however, the severity of pathological symptoms can be increased by coinfection with other viruses, particularly the porcine circovirus 2 (PCV2).
EN
Wild boars (Sus scrofa) are widely distributed in many countries. In recent years, their population has been expanding in most regions, despite hunting. Wild boars are known reservoirs for a number of infectious diseases that are transmissible to pigs and humans. Swine influenza (SI) is a viral respiratory disease of pigs of substantial importance both for the swine production sector and for public health. The aim of the paper is to describe the exposure to SIV of 2801 wild boars shot in 12 voivodeships of Poland from 2011 to 2014. It was assessed by the HI test. In 2011/2012, antibodies to H1N1 were found in 6.43% of wild boars’ sera. In 3.07% of sera the seroconversion to H3N2 was noted. In 2012/2013, 6.23% of sera examined were positive for H1N1, 2.67% of sera were positive for H3N2 and 3.76% of sera had antibodies to A(H1N1)2009pdm-like. In the following hunting season, antibodies to H1N1, H3N2 and A(H1N1)2009pdm-like were detected in 7.74%, 2.27% and 1.74% of samples, respectively. In 2011-2014, there were no sera samples positive for the H1N2 virus. In total, the percentage of wild boars with antibodies to SIV ranged from 0 to 6.25%, depending of the subtype. In some animals, mixed infections with different subtypes of SIV were found. In general, antibody titers were low. In summary, we confirm the exposure of wild boars’ population in Poland to SIV. On the basis of the results obtained, we suggest that their role in SIV transmission to pigs and humans has been limited. This situation may change, and therefore the monitoring of wild boars’ health status should be continued.
EN
The presence of Aujeszky’s disease of swine (AD) on the OIE list of infectious diseases of particular importance is the basis for the activities of the National Veterinary Service aimed at its eradication. Namely, achieving freedom from this disease in swine in a country is the prerequisite for being able to export them to other countries. In relation to this, the objective of the present review was to present opinions concerning the risk of infection of domestic swine from the reservoir of Aujeszky’s disease virus (ADV) present in feral swine and wild boars. On the basis of serologic and virologic investigations performed in the USA in feral swine and in several European countries, including Poland, in wild boars, usually subclinical ADV-caused infections were demonstrated. However, in no case could a connection between these infections and AD in domestic swine be demonstrated. On the basis of these findings it was agreed that freedom of swine from AD in a country would be recognized internationally, if requirements of the OIE and EU are fulfilled concerning domestic swine. This means that existing reservoirs of ADV in feral swine and wild boars do not interfere with this status. It is, however, recommended to perform seasonal monitoring of feral swine and wild boars for ADV infection, for example during hunting seasons.
EN
Capreolus capreolus and Ixodes ricinus as a reservoir of Bartonella in north-western Poland. The purpose of the study was to assess the prevalence Bartonella in Capreolus capreolus from north-western Poland forest. Supplementary, ticks infesting roe deer were also screened in order to ascertain their role as vectors and reservoirs of Bartonella. The samples of blood from 98 animals from north-western Poland were PCR-screened. Bartonella DNA was detected by using primers complementary to the intergenic spacer (ITS) between the 16S and 23S rRNA genes, which is used for identification of over a dozen species of this genus. Products of three different sizes were detected: 230 bp and 290 bp may represent two strains of B. capreoli, and 190 bp may be identify as B. bovis. All three amplicons were detected in blood, the 290 bp fragment from B. capreoli was present only in ticks, Ixodes ricinus. Generally, Bartonella infection in C. capreolus amounted to 21.4% of individuals, but was much higher during the autumn-winter seasons (62%), than in spring (4.3%). The results show that C. capreolus may be a reservoir for at least two species, i.e. B. capreoli and B. bovis, and probably do not cause persistent infection in roe deer. The high percentage of infested individuals during spring (84%) and infection detected in I. ricinus (5.2%) show that ticks are reservoir and vector of Bartonella.
EN
An increase in Yersinia enterocolitica human infections has recently been noted. The numerous cases noted in other countries of this bacterium has begun to rival other widespread alimentary tract pathogens. Yersiniosis is a disease diagnosed mainly in humans, but symptoms of infection in numerous domestic and wild species of animals have been observed. Swine are the most important reservoir of human pathogenic Yersinia enterocolitica strains. However, there is evidence that pets can also be carriers of these strains, thus causing the disease in people. Most human pathogenic strains of Yersinia enterocolitica have been derived from puppies and kittens. These animals can be a source of infections, particularly during close contacts with children. Although dogs and cats are not the most important reservoir and source of Yersinia enterocolitica infections, this micro-organism should be included in differential diagnosis of enteritis, especially when its symptoms include bloody diarrhoea in young animals.
EN
Human and animals influenza is caused by the virus possessing 8 RNA segments in the genome. The segmented nature is critical structural feature that allows influenza viruses to undergo genetic reassortment. Pigs are important reservoir of influenza viruses because they express two types of receptors in the trachea which can bind swine, human and avian influenza viruses during infection. Therefore reassortation of viruses’ segments from different origin and subtypes can occur and facilitate in this way the generation of the strains with pandemic potential. Pigs can infect human with influenza virus directly which was several times confirmed. However the monitoring of pig care takers health indicate that it happened occasionally. In April 2009 the first cases of influenza, caused by the new strain of influenza type A H1N1, possessing genes of swine origin of unknown combination, occurred in North America. Within few days influenza spread and over 1000 people in 21 countries developed the illness, including 27 deaths. New A H1N1 strain possesses pandemic potency and is transmitted between humans only. Up to now none of the cases reported worldwide have had any direct contact with pigs. More over infected person introduced the mutant into the pig herd which may increase the risk of further reassortation. Data concerning the epidemic of A H1N1 strain are presented in this paper.
EN
Salmonella is considered a natural compound of reptile gastrointestinal tract flora and the rate of asymptomatic carriers can reach 100%. The prevalence varies in tested populations and depends on many factors, such as habitat, diet, intermittent shedding, but also on the culture method used in the study. Reptiles carry a wide variety of Salmonella serotypes including those specific for cold-blooded animals, but also those belonging to Salmonella enterica subsp. enterica. Salmonella in reptiles may be transmitted both horizontally by direct contact between individuals or via a contaminated environment as well as vertically. Colonized reptiles are considered a human health risk and direct contact is not a prerequisite for transmission. Infants, pregnant women, elderly and immune-compromised persons are at an increased risk for reptile-associated Salmonella infections. Detailed studies are necessary to evaluate the prevalence in pet reptile populations and potential consequences for humans.
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