The last time fatality from the disease was recorded on Apr 13
The US Food and Drug Administration, FDA, in September authorised the extra shot for those aged 65 and above, people at high risk of severe disease, and others regularly exposed to the virus.
Pfizer and US health officials have argued that the boosters prevent hospitalisations and deaths and that emerging data indicates they can slow mild infections as well.
Pfizer did not immediately respond to requests for comment.