Former CDC Director Warns of Imminent Bird Flu Pandemic

Robert Redfield highlights the high mortality rate and potential for human-to-human transmission

Bird flu has a mortality rate between 25% and 50% when it infects humans.
The virus is spreading among various mammals in the United States.
Gain of function research has identified the amino acids needed for human transmission.
Concerns are rising over the virus's presence in cattle, which are often near pigs.
Redfield emphasizes it's a matter of 'when,' not 'if,' a pandemic will occur.