In October 1982 the death of approximately 1,500 wild ducks, mostly mallards (Anas platyrhynchos), and about 100 shore birds including greater yellowlegs (Tringa melanoleuca) was observed in the New York State Oak Orchard Wildlife Management Area. The lack of gross pathology, the signs exhibited by the moribund ducks, and the ecologic conditions indicated possible botulinal intoxication. Clostridium botulinum toxin type C was demonstrated in duck serum (approximately 5 × 104 mouse intraperitoneal LD50 of toxin per ml of serum) and in an extract from fly larvae (Lucilia spp.) taken from the same area (approximately 1 × 106 mouse intraperitoneal LD50 of toxin per gram of larvae).
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