Introduction: The aim of the study was to determine the prevalence of respiratory capillariosis in red foxes (Vulpes vulpes) in some regions of Serbia. Material and Methods: The study was conducted on 102 foxes in six epizootiological regions of Serbia, during the hunting season between 2008 and 2012. Results: The presence of respiratory capillariosis in all tested epizootiological regions was confirmed. The E. aerophilus nematode was detected with overall prevalence of 49.02%. The diagnosis of E. aerophilus infection was confirmed by the determination of morphological characteristics of adult parasites found at necropsy and the trichurid egg types collected from the bronchial lavage and the content of the intestine. Conclusion: The presented results contribute to better understanding of the epidemiology of this nematodosis in Serbia. However, the high prevalence of capillaries in tested foxes, demonstrated in all explored areas, might suggest that foxes from other regions in Serbia may also be infected. The fact that domestic carnivores and humans can also be infected enhances the importance of the overall epidemiological status. To establish the relevant prevalence of respiratory capillariosis, further investigations and continous monitoring of parasitic fauna of carnivores are needed in the whole country.

Genus Culicoides spp. includes small insects 0.5-2 mm in length, usually grey or black and at first glance very similar to mosquitoes. They are strictly hematophagous, feeding by attacking hosts outdoors and indoors (although they are less susceptible to the stationing like Aedes mosquitoesdo). The sting is very painful at the injection site and often followed by hypersensibilisation with the consequent formation of allergic dermatitis. Inaddition, the insects carry and transmit a multitude of diseases, often of a zoonotic character, and therefore are of great epidemiological importance. In our country, continuous monitoring of Culicolides spp. has been carried out and seasonal dynamics of their appearance in the period 2015-2016 is presented in this article. During October 2015, the presence of Culicolides spp. was confirmed in 10.00% of samples; in November, their presence was not established, whereas in December, 2.35% of samples proved positive for the presence of Culicolides spp. During 2016, from January to March, no Culicolides spp. were found in any of the examined samples. During April, their prevalence was 9.63%, in May - 6.74%, in June - 3.70%, in July - 15.78%, in August - 18.07%, in September - 27.27%, and in October - 45.65%. In Serbia, the dominant Culicoides spp. species are Obsoletus complex and Pulicaris complex established in 57.21% and 33.37% of samples, respectively. Other species are present in lesser extent. In Obsoletus complex, the dominant species was Culicoides obsoletus/scoticus. The percentage of Culicoides obsoletus /scoticus males in samples was 25.52%. Non-pigmented (young) females were present in 66.06% of samples; females who took blood in 7.55% and 0.87% were gravid females. In Pulicaris complex, the dominant species was Culicoides pulicaris. Males of Culicoides pulicaris were found in 19.23% of samples, non-pigmented (young) females in 70.96%, females who took blood in 9.08% while 0.73% were gravid females.

This paper presents the results of two-year investigations of parasitic infections of the digestive tract of dogs originating from the territories of eight municipalities of Branicevo District. Investigations were performed on 345 dogs of different breeds and age categories, originating from rural and urban environments. The investigations encompassed dogs bred in decent hygiene conditions, as well as dogs living in unhygienic conditions. Some of the dogs covered by these analyses were dewormed, but the bulk of the sampled material originated from dogs that were not treated with antihelminthics. Eight species of parasites of the digestive tract were diagnosed in the examined dogs from the territory of the Branicevo District: Toxocara canis, Ancylostoma caninum, Uncinaria stenocephala, Trichuris vulpis, coccidiae, Dipylidium caninum, Taenia spp. and Alaria alata. Today, it is still necessary to keep dogs in rural environments and isolated areas, since these animals are used to guard real estate and cattle. For quite some time now, there has also been wide-spread interest in keeping dogs in urban areas as well. It is evident on the grounds of data from big towns that the number of dogs in urban environments has been increasing constantly all over the world. However, the conditions for naturally maintaining dogs in towns have become increasingly more difficult and complicated. The amount of free space and the number of yards are constantly being reduced, so that dog owners are compelled to keep their pets in apartments. These altered living and diet conditions have resulted in more complex and varied health problems of dogs.

During 2017, 784 insect samples were examined and the presence of Culicoides spp. was established in 25.51% of samples. Earlier research has found that the dominant population of Culicoides spp in Serbia belongs to Obsoletus complexes, established in 60.05% of analyzed samples. Out of the entire insect population analyzed, males were found in 22.84%, unpigmented (young) females in 67.97%, females who took blood in 7.39%, whereas 1.35% were gravid females. Culicoides spp. from the Pulicaris complex was established in 38.85% of examined samples. Males were found in 18.91%, unpigmented (young) females in 71.72%, females who took blood in 9.09%, and 1.11% were gravid females. Other types of culicoids have been established in less than 10% of the examined samples. During examination, the most prevalent species were Culicoides obsoletus, C. picturalis, C. lupicaris, C. scoticus and C. fascipennis.