WASHINGTON (AP) — Nearly 4 million doses of the newest COVID-19 vaccine will be shipped Sunday night, and will begin to be delivered to states for injections starting on Tuesday.

White House COVID-19 coordinator Jeff Zients announced that the entire stockpile of the newly approved single-dose Johnson & Johnson vaccine will go out immediately. J&J will deliver about 16 million more doses by the end of March and 100 million total by the end of June.

Though the new shot is easier to administer and requires only one dose, the administration is not altering its distribution plans. Zients says, “We’re distributing the J&J vaccine as we do the Moderna vaccine and the Pfizer vaccine.”

Dr. Anthony Fauci, the nation’s top infectious disease expert, and Dr. Marcella Nunez-Smith, the chair of the White House equity task force, encouraged Americans to take the first dose available to them, regardless of manufacturer.