The Food and Drug Administration granted emergency use authorization for the single-shot COVID-19 vaccine from Johnson & Johnson on Saturday, an addition to the national supply that will further accelerate the immunization rate.

“The authorization of this vaccine expands the availability of vaccines, the best medical prevention method for COVID-19, to help us in the fight against this pandemic, which has claimed over half a million lives in the United States,” said acting FDA Commissioner Janet Woodcock. “The FDA, through our open and transparent scientific review process, has now authorized three COVID-19 vaccines with the urgency called for during this pandemic, using the agency’s rigorous standards for safety, effectiveness and manufacturing quality needed to support emergency use authorization.”