Breakthrough Emergency Vaccine Approved to Save Critically Endangered California Condors

Federal officials have granted emergency approval to a bird flu vaccine for use in California condors.
More than 20 California condors have died from the H5N1 virus.
The vaccine will first be given to captive birds and closely monitored.
California condors number fewer than 600 worldwide.
Officials may start a mass poultry vaccination to stop further outbreaks.