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The objective of this study was to investigate the ascarid infection in Asiatic lions using scat samples, based on microscopic analysis, PCR amplification of the ITS-2 region of ribosomal DNA and sequence analysis of the amplicons. Microscopic analysis indicated the presence of eggs of Toxascaris leonina in eleven of the sixteen scat samples analysed and in one of these eleven scats eggs of Toxocara cati were also detected. In five of the scats eggs were not detectable. The presence of T. leonina in all the infected samples was also confirmed by PCR amplification of the ITS-2 of ribosomal RNA gene and five of these also showed amplicons corresponding to T. cati, respectively. Toxocara canis infection was not observed in any of the scat samples. Nucleotide sequence analysis of the ITS-2 region indicated 97% to 99% similarity with T. leonina and T. cati, respectively. To our knowledge, this is the first molecular characterization of ascarid infection in captive Asiatic lions from a zoological garden of India. This study also indicates that Asiatic lions are more prone to infection either with T. leonina or T. cati and the parasite is not host specific.
The increasing number of dogs, including stray ones, was the reason for carrying out the pilot study on the extensiveness of verminous invasion in these animals in four central and 7 suburban quarters of Olsztyn. Fresh samples of faeces taken from 220 dogs, coming from 20 animals from each district, were examined for the presence of parasite eggs and segments of tapeworms and adults nematode forms. The studies revealed mainly the presence of nematodes and to a smaller degree the segments of Diphylidium caninum (1.3%). The extensiveness of parasite invasion commonly ranged from 10 to 45%. Toxocara canis occurred most frequently (11.8%). Moreover, eggs of Ancylostomatidae (2.7%), Toxascaris leonina (1.8%) and Trichocephalus vulpis (1.3%) were found. One can conclude that due to their carrier state of parasites, dogs in towns and cities may constitute a potential health hazard for the inhabitants. This fact is all the more significant since only a small number of animals show clinical signs of infestation.
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