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H5N1 influenza virus is a type of influenza A virus which mostly infects birds. H5N1 flu is a concern because its global spread may constitute a pandemic threat. The yardstick for human mortality from H5N1 is the case-fatality rate (CFR); the ratio of the number of confirmed human deaths resulting from infection of H5N1 to the number of those confirmed cases of infection with the virus.
Up to 140 million birds are believed to have died or been killed because of the outbreak. In April 2005 there begins an unprecedented die-off of over 6,000 migratory birds at Qinghai Lake in central China over three months. This strain of H5N1 is the same strain as is spread west by migratory birds over at least the next ten months.
A culling with the bird poison DRC-1339 received national attention after USDA employees dispensed the substance in Griggstown, New Jersey to kill an estimated 5,000 starlings that plagued feed lots and dairies on local farms. When "it began raining birds" community members became alarmed, unsure whether a toxin or disease was at work.
English: 'Causes of avian mortality in the United States, annual' based on article Environmental Impact of Wind Power, section Birds, table "Causes of avian mortality in the United States" with cited sources per 13:15, 2 August 2013 as followsː
Wildlife experts in at least six states are investigating the cause of the bird deaths. Birds acting blind when approached, dying by hundreds. Scientists don't know why.
The bird at the center of the worst single-species mortality event in modern history isn’t recovering, scientists say Julianna Bragg, CNN December 26, 2024 at 11:18 AM
Mourning doves are prolific breeders. In warmer areas, these birds may raise up to six broods in a season. [33] This fast breeding is essential because mortality is high. Each year, mortality can reach 58% a year for adults and 69% for the young. [38] The mourning dove is generally monogamous and forms strong pair bonds. [38]
San Mateo County public health officials reported finding H5N1 bird flu in a pet cat and a backyard poultry flock. ... first Morbidity and Mortality Weekly Report ... by the Los Angeles Times to ...