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Louisiana will allow people who are 65 and older to access COVID-19 vaccines starting Monday as the state sees more doses and some slowing appointments, officials said Thursday, a move that will bring the number of people eligible for the shots to more than 1 million of the state’s roughly 4.6 million residents. Gov. John Bel Edwards announced the expansion at a press conference Thursday, saying an increase in doses made the move possible. Up until now, people age 70 and older, a list of health workers as well as residents and staff of long-term care facilities like nursing homes have been able to get the shots.

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Operation Warp Speed invested billions of taxpayer dollars to develop safe and effective vaccines to protect people against the worst outcomes from COVID-19. Under the Emergency Use Authorization (EUA), the pharmaceutical industry has delivered — in record time — two vaccines with Food and Drug Administration (FDA) approval. Johnson & Johnson and Novavax have released promising efficacy data from their phase 3 clinical trials. Immunizing health care workers and those living in long-term care facilities was slower than expected, largely due to the logistics of getting people vaccinated. The vaccine supply chain is now beginning to show some structure, with the expectation that there will be ample supply and capacity to immunize everyone who wants to be immunized by the summer.   

They all started in the same place, with no one immunized, no stockpiles of vaccine and no choice but to dive in immediately with perhaps the most high-stakes public health campaign in American history. Seven weeks later, the nation’s states are all racing to deliver a potentially lifesaving defense against the novel coronavirus to millions of arms. But some states are having far more success than others. In the states moving fastest, up to 1 in 7 people had received at least their first injection as of Wednesday, according to data compiled by The Washington Post. At the other end of the rankings, it was 1 in 17.

Beginning in August, a half-dozen researchers at a Pfizer lab in Massachusetts sat down with vials of experimental coronavirus vaccine to learn how to transform the “overfill” in every vial — an extra amount of liquid that is standard for injectable pharmaceuticals — into a precious sixth dose. Over the next few months, they tested dozens of different combinations of syringes and needles, drawing out vaccine and squirting it into a beaker resting on a digital scale, repeating the experiments 5 to 10 times for each. By Jan. 6, the work paid off. Pfizer won approval from the Food and Drug Administration to say its vials contained six doses, instead of the five the agency had approved less than a month earlier with its Dec. 11 emergency authorization of the vaccine.