| Summary: | Gastrointestinal parasites are widespread pathogenic agents and one of the main causes for mortality in young dogs and cats. Many of these zoonotic parasites are relevant in terms of public health. The presence of parasites in the animal organism causes local and general modifications in the various organs they parasitize or transit throughout their life cycle. The present study aimed to identify the most frequent gastrointestinal parasites of dogs and cats and to monitor the alterations that occur in terms of haematological and biochemical parameters. The studied animals, 25 dogs and three cats from Timiș and Caraș Severin counties, were brought to the On-call room of the University Clinics of the Faculty of Veterinary Medicine Timișoara. The laboratory methods that were used were the Willis flotation method, the Baerman larvoscopic method and the Lugol method. The haematological methods, namely flow cytometry, cytochemistry and spectrophotometry, were performed at Bioclinica Laboratories, on whole blood samples that were collected in EDTA or simple tubes. The studied animals were positive for Giardia, Cystoisospora, Dipylidium, Ancylostoma, Toxocara and Trichocephalus. The positivity rate was 57.14%, with prevalence rates according to the parasitic species ranging from 3.57% to 21.42%, with multiparasitism in 32.14%, and monoparasitism in 17.85%. The values recorded for red blood cells, haemoglobin and hematocrit followed the same trendmost of the animals being situated within physiological values, except for three dogs, that recorded values below the minimal level. In the case of MCH (mean corpuscular haemoglobin) and MCHC (mean corpuscular haemoglobin concentration) the values recorded for most dogs were within physiological limits, except for three dogs which overpassed the maximum level. Eosinophils were high in all dogs, which is a characteristic feature of parasitism. The serum urea concentrations revealed the fact that all for dogs that were taken into study had values above the maximum limit.
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