Over the last 3 years, chronic respiratory distress occurred occasiona
lly in young birds on a farm with about one hundred Rheas americana. T
he sick Rheas died after 1 to 2 months, Post-mortem examination of a 7
-week-old Rhea showed severe tracheitis, This tracheitis was caused by
Synchamus trachea worms, which were present in large numbers, Therapy
with fenbendazole cured the respiratory distress of the other Rheas w
ithin a few days.