Bird flu has infected nearly 70 people in the United States, with one death, since last April. Most of those infections have been among farm workers exposed to infected poultry or cows.
The US Centers for Disease Control and Prevention, however, has said the risk to the general public from bird flu is low.
A conditional approval, called a conditional license, is used for emergencies, limited market availability, or other special circumstance and is issued for a finite period of time.
The US had built a poultry vaccine stockpile after major bird flu outbreaks in 2014 and 2015, though they were never used.
Separately, Moderna is developing a bird flu vaccine for humans and has received about $766 million from the US government for its advancement.
The company said last month it was preparing to advance its experimental shot, mRNA-1018, into late-stage trials based on preliminary data from an early- to mid-stage study.
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