The White House says a third shot is possibly needed, 9 to 12 months after the initial shot.
- the duration of immunity after vaccination is being studied
- in the meantime a booster injection could be needed
Info via David Kessler, chief science officer for President Joe Biden's COVID-19 response task force, testimony to a congressional committee meeting on Thursday (US time).
Pfizer also a 3rd shot of vaccine will likely be needed.
- within 12 months
- could be a need annual shots (CNBC reported based on his comments from April 1, which were made public on Thursday)