Monica Lopez, a nurse at Children's Hospital Los Angeles, prepares to administer the Pfizer/BioNTech COVID-19 vaccine to 3-year-old Callum Diaz-Cheng during the hospital's first round of vaccines ...
The interval between first and second doses of the Pfizer and Moderna Covid-19 vaccines may be as long as eight weeks for certain people, the US Centers for Disease Control and Prevention said in ...