Currently, the booster injection is allowed to be administered only to persons with weakened immunity.
Pfizer and BioNTech said on Wednesday that they had begun the process of obtaining full approval for a booster dose of their COVID-19 vaccine for people over the age of 16.
The companies intend to complete the submission of documents by the end of this week. This may open the way to vaccination with the third dose for people with a weakened immune system.
The U.S. authorities previously stated that booster vaccinations against COVID-19 would be widely available from September 20.
Earlier this week, U.S. regulators fully approved the two-component Pfizer/BioNTech vaccine based on updated results of clinical trials and verification of the production process.
The third dose of the vaccine is currently not allowed for widespread use in the United States. However, according to the updated authorization for use in emergencies, the third dose can be administered to people with weakened immunity over 12 years.