The flock had been transferred 20 days before the
outbreak to an area in which a large amount of seeding C.
retusa was present; this area had been used in previous
years for rice, corn, and cassava cultivation. Thirty-four
(22.7%) sheep were affected and died within approximately
30 days. The flock was moved from the paddock 20
days after the start of the outbreak; at this time 26 sheep
had died, and 6 had clinical signs of poisoning. Two other
sheep became affected after the withdrawal of the flock