ZOOL 462A Lecture Notes - Lecture 20: Snow Goose, Canada Goose, Tulare Lake
Document Summary
Avian cholera - 70s chesapeake bay and rainwater basin nebraska. In nebraska"s rainwater basin outbreaks occurred annually from 1975-1982, one killed 70,000 100,000 waterfowl. At present: central valley and tulare basin, klamath basin, and rainwater basin primary impact areas. Can be extremely acute in one case 20,000 snow geese returned to refuge from feeding 1,100 were dead in morning. Individuals can look normal and die 10 minutes later. Intestine dilated and filled with clear gelatinous mucoid material. Isolate and identify the bacteria for a definitive diagnosis. Not clear on how the bacteria is maintained in the environment. Occurs in same wetland multiple years suggesting maintained in the environment but never isolated in wetlands when birds aren"t present. Antibodies have been found in snow geese indicating birds can carry the disease for long periods of time. Spread from secretions or excretions of infected birds. Clostridium botulinum type c (type e fish and gulls, type a humans)
