Also, duck plague was suspected as the cause of mortality in muscovies from San Marcos, California. A local breeder had mortality in approximately 100 caged muscovies and no other action was taken. Mortality in swallows was reported from the Nebraska Panhandle and Eastern Wyoming area. Emaciation was diagnosed as the cause of death and it is thought that the cold weather in the area may have contributed to decreased availability of their food source. Salmonellosis was diagnosed as the cause of death for an estimated 100 black crowned night herons and snowy egrets in Napa, California.
Salmonellosis outbreaks are usually a problem in passerine birds using bird feeders.
There are two salmonellosis outbreaks previously reported in egrets in California and one outbreak in cattle egrets in Texas. To date, no human cases of tuberculosis have been traced back to exposure to deer and no livestock were found to be infected with bovine tuberculosis. Oregon Coastal Refuges reported the mortality of at least 10,000 common murres. This is the most significant mortality recorded in adult murres in Oregon in the last 20 years that records have been kept. Emaciation has been a consistent finding in necropsied birds.