Haematology, blood chemistry and urine parameters of free-ranging plains viscachas (Lagostomus maximus) in Argentina determined by use of a portable blood analyser (i-STAT) and conventional laboratory methods.

Haematology, blood chemistry and urine values were determined for 44 adult free-ranging plains viscachas (Lagostomus maximus; Rodentia, Chinchillidae) in their pampas habitat in central Argentina. The study animals were captured in the wild and anaesthetized with a ketamine-xylazine combination for physical examination and sampling. Blood was obtained by venipuncture of the saphenous vein. Results for many of the blood parameters fall within the reference ranges for pet chinchillas. Differentiation of white blood cells revealed a predominantly neutrophil count for plains viscachas, while chinchillas have predominantly lymphocytes. Mean values for blood urea nitrogen, creatinine, aspartate aminotransferase and sodium were higher than the upper limit of the reference range for pet chinchillas. The results of seven analytes (haematocrit, haemoglobin, glucose, blood urea nitrogen, sodium, potassium, chloride) were compared by using both a portable blood analyser (i-STAT) in the field and conventional laboratory methods. In general, correlation and agreement between the two methods were low for most parameters.

[Dicrocoeliasis in New World camelids]. / Dikrozöliose bei Neuweltkameliden.

Natural infections with the lancet fluke (Dicrocoelium dendriticum) were detected in a group of seven diseased or dead/euthanized South American Camelids (five Llamas, two Alpacas) from Switzerland and Southern Germany. Clinical findings in almost all the animals revealed an acute decline of general condition followed by recumbency, decreased body temperature and a varying degree of anaemia. Concurrently, all animals showed an average to poor nutritional status. All liver enzyme activities analysed in serum biochemistry conformed to the reference values and therefore offered no diagnostic clues for this disease. Necropsy however, disclosed major alterations in the liver in the form of cirrhosis, abscesses, granulomas, and a massive infestation with D. dendriticum. The coprological investigations performed at the outset of the examinations revealed eggs of the lancet fluke in only two animals. This suggests that clinical findings alone permit at best only a provisional diagnosis. Repeated coprologic follow-ups showed that the presence of eggs of D. dendriticum can be diagnosed accurately and that clinical signs appear with an excretion rate above 1000 eggs per gram faeces (EpG). In these cases, praziquantel in a single dose of 50 mg/kg per os was given. This treatment was well tolerated and achieved a quite acceptable 90% reduction of eggs in the faeces.