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WASHINGTON — President Joe Biden spent his first 100 days in office encouraging Americans to mask up and stay home to slow the spread of the coronavirus. His task for the next 100 days will be to lay out the path back to normal.

When he entered office, Biden moved swiftly to overcome problems with vaccine supply and more than tripled the country’s ability to administer them. But ending the coronavirus pandemic, the central challenge of his presidency, will require not only putting shots into arms — a task now growing more difficult as demand sags — but also a robust plan to help the nation emerge from a year of isolation, disruption and confusion.

If Biden launched the nation onto a war footing against a virus that infected nearly 200,000 Americans in January and killed about 3,000 of them per day, the next months will be tantamount to winning the peace. Already, deaths are down to fewer than 700 per day, and average daily cases are below 60,000. U.S. officials insist there is a long way to go before the country can be fully at ease, but the progress is marked.

Going forward, success will mean finishing the nation’s herculean vaccination campaign — to date, 43%.