Sandra Lindsay, a nurse at Long Island Jewish Medical Center, is inoculated with the Pfizer/BioNTech Covid-19 vaccine by Dr. Michelle Chester in Queens, New York, on December 14. | Mark Lennihan/AP

Doses of the vaccine are now rolling out to all 50 states.

The United States launched its largest vaccination campaign in history Monday as people began to receive the first doses of the two-dose Pfizer/BioNTech Covid-19 vaccine.

Hospitals in all 50 states have started to receive the vaccine, and health care workers at the front lines of the pandemic are among the first people to receive the injections.

In New York City, Sandra Lindsay, an intensive care nurse at Long Island Jewish Medical Center in Queens, became the first person in the United States outside of a clinical trial to receive the injection.

Mark Lennihan/AP Intensive