The prevalence of Trichomonas gallinae in budgerigars (Melopsittacus undulatus) in a Veterinary Clinic in Vienna between 2000–2019

The aim of this clinical retrospective study was to analyse the prevalence of Trichomonas gallinae in budgerigars (Melopsittacus undulatus). The role of T. gallinae in budgerigars as the cause of a typical clinical picture (young vomiting budgerigars) is clear; however, the frequency of latent and subclinical diseases in pet birds is unclear. Over the period of 20 years (2000–2019), 16 759 birds were examined, of which 5 256 (31.36%) belonged to the genus Melopsittacus (budgerigars). Within the 5 256 presented budgerigars, 2 547 (48.45%) were examined for trichomonads using a microscopic examination of a crop wash, and, of those, 978 birds (38.39%) were found to be positive for T. gallinae. Only 96 (9.8%) of the positive budgerigars showed typical signs of the disease, such as loss of appetite, vomiting, weight loss or anorexia. Unspecific clinical signs were seen in 312 (31.9%), while 570 birds (58.3%) did not show any clinical signs and had been presented for a routine check or other medical problems. Treatment using metronidazole (Anaerobex, Flagyl) was successful in 82–85% of these diseased birds. Trichomonads can be detected in over a third of budgerigars, even if less than 10% of the positive ones show clinical symptoms.