Health officials in several countries are urging vaccine makers to limit the number of doses they distribute to consumers.
In the US, the FDA has proposed capping the number in a bid to limit any risks to health or public health.
The CDC has proposed limiting the number to 2,000 doses a year.
In Australia, the agency is seeking to limit vaccine sales to 1,000 a year to make sure vaccines are safe and effective.
The UK is also reviewing its policies, and Australia has banned the distribution of vaccines to people who have been exposed to the coronavirus.
What are the key facts about coronaviruses?
How many coronavires have been found?
What are some of the most common types?
Who gets them?
How do they spread?
What is the treatment for coronaviral infections?
What do coronavire infections look like?
What does the virus do?
How is it spread?
How does it spread through the air?
How can the US prevent it?
How are coronaviroids spread?