Infections with Angiostrongylus vasorum and Crenosoma vulpis are canine parasitic diseases with an increasing number of registered cases in Denmark. Traditionally the diagnosis is made by examination of faeces by the Baermann method after an incubation period of 24 hours. Since the disease can have both a chronic and an acute course, the treatment success can depend on early diagnosis.

The aim of the study was to examine the value of 2 modified Baermann methods with an incubation time of 0 and 1 h. The results of the study showed that 92,3% of the positive samples for Angiostrongylus vasorum and 30% of the positive samples for Crenosoma vulpis could be diagnosed within 1 hour. This makes a modified Baermann method a useful diagnostic aid when dealing with patients suspected of infection with either Angiostrongylus vasorum or Crenosoma vulpis.