US preparing for 1-year COVID-19 booster shots; Pfizer chief sees need
Kessler said while the duration of immunity after vaccination is being studied, booster vaccines could be needed.
Fri Apr 16 2021
US becomes first nation to cross 10 million COVID-19 cases as third wave of infections surges
The country reported a record 131,420 COVID-19 cases on Saturday and has reported over 100,000 infections four times in the past seven days.
Mon Nov 09 2020