More than 5 million Americans have missed getting their second coronavirus vaccine dose, indicating a growing trend that could endanger the U.S.’s efforts to return to normalcy.

The New York Time reports that the rate of people missing their second dose of the Pfizer of Moderna vaccine has more than doubled since the beginning of the national vaccine rollout. Five million people accounts for about 8 percent of those who received a first dose of the Prizer or Moderna vaccine.

Several people interviewed by the Times said they were afraid of the vaccine's side effects, while others told the newspaper they felt protected by one dose.

But some patients were unable to get a second dose due to issues with vaccine availability, the Times reported.

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Several people who got their vaccines at Walgreens told the Times that after their first dose, they were sent to a pharmacy that carried a vaccine from a different company. Some were able to get the proper vaccine in time, but others gave up.

Jim Cohn, a spokesman for Walgreens, told the Times that this problem accounted for "a small percentage" of the people who were vaccinated through the pharmacy chain, adding that 95 percent of people who got vaccinated at Walgreens received their second dose. Read more at The Hill