Dr. Anthony Fauci said this week that he is optimistic that the United States will have millions of coronavirus vaccines available by the end of the year.

“By the beginning of 2021, we hope to have a couple of hundred million doses,” said Fauci, the director of the National Institute of Allergy and Infectious Diseases and member of the White House Coronavirus Task Force.

Fauci made the comment during an interview with the American Medical Association. He also added that there are currently four to five trials underway for vaccine candidates that will combat the COVID-19 virus.

Fauci mentioned said Phase III trials for a vaccine candidate developed by Moderna are expected to start in early July. In addition, another candidate from AstraZeneca is proceeding in a similar process.

“I’m cautiously optimistic that with the multiple candidates that we have with different platforms, that we’re going to have a vaccine that shows a degree of efficacy that would make it deployable,” said Fauci.

Fauci’s comments come weeks after the Trump administration launched “Operation Warp Speed,” an initiative to get vaccines to the American public as fast as possible, so the U.S. can return to normalcy.

President Donald Trump vowed to use “every plane, truck and soldier” to distribute COVID-19 vaccines and it the hope of his administration to begin doing so by the end of 2020.