The Biden administration is giving states an approximately 17% boost in vaccine during the next three weeks following complaints of shortages so severe that some vaccination sites around the U.S. had to cancel tens of thousands of appointments with people seeking their first shot.

Detailed figures posted on the Centers for Disease Control and Prevention website Tuesday showed the government plans to make about 10.1 million first and second doses available next week, up from this week’s allotment of 8.6 million. The figures represent doses of the Pfizer and Moderna vaccines. The increase comes amid complaints from governors and top health officials about inadequate supplies and the need for earlier and more reliable estimates of how much vaccine is on the way so that they can plan accordingly.

President Joe Biden announced the surge in deliveries to states Tuesday afternoon, along with the news that the federal government is purchasing an additional 100 million doses each of the two approved coronavirus vaccines for delivery this summer. The government expects to be able to deliver enough of the two-dose regimens to states to vaccinate 300 million people.

The purchases from drugmakers Pfizer and Moderna come as the Biden administration is trying to ramp up vaccine production and states’ capacities to inject them into arms.

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Seeking to address concerns from state and local leaders that supplies have been inconsistent, Biden pledged to provide states with firm vaccine allocations three weeks ahead of delivery to allow for accurate planning for injections.

Biden’s announcement was to follow his administration’s first virus-related call with the nation’s governors Tuesday.

The administration has also promised more openness and said it will hold news briefings three times a week, beginning Wednesday, about the outbreak that has killed more than 423,000 Americans.

The setup inherited from the Trump administration has been marked by miscommunication and unexplained bottlenecks, with shortages reported in some places even as vaccine doses remain on the shelf.

Dr. Rochelle Walensky, Biden’s new CDC director, was herself flummoxed over the weekend in trying to describe current supplies.

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“I can’t tell you how much vaccine we have,” she told “Fox News Sunday,” describing the problem as a challenge left by the outgoing Trump administration. “And if I can’t tell it to you, then I can’t tell it to the governors, and I can’t tell it to the state health officials.”

Officials in West Virginia, which has had one of the best rates of administering vaccine, said they have fewer than 11,000 first doses on hand even after this week’s shipment.

“I’m screaming my head off” for more, Republican Gov. Jim Justice said.

California, which has faced criticism about a slow vaccine rollout, announced Tuesday that it is centralizing its hodgepodge of county systems and streamlining appointment sign-up, notification and eligibility. Residents have been baffled by the varying rules in different counties.

And in Colorado, Democratic Gov. Jared Polis said the limited supply of vaccine from the federal government is prompting the state to repurpose second doses as first doses, though he expects that people scheduled for their second shot will still be able to keep their appointments.