California wildlife officials say a January outbreak of avian cholera has killed thousands of ducks, gulls and other water birds at the Salton Sea. Such outbreaks occur annually due to birds flocking closely together during migration. Officials with the California Department of Fish and Wildlife and the Sonny Bono National Wildlife Refuge said they collected and incinerated more than 1,200 carcasses. The birds tested positive for avian cholera, an infectious disease that occurs in California each winter. Officials say the water birds are most susceptible to the disease during stressful periods.
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