U.S. health officials Wednesday recommended all Americans get COVID-19 booster shots to shore up their protection amid the surging delta variant and evidence that the vaccines' effectiveness is falling.

The plan, as outlined by the director of the Centers for Disease Control and Prevention and other top authorities, calls for an extra dose eight months after people get their second shot of the Pfizer or Moderna vaccine. The doses could begin the week of Sept. 20.

Health officials said people who received the single-dose Johnson & Johnson vaccine will also probably need extra shots. But they said they are awaiting more data and have yet to work out a plan.

The plan is still awaiting a Food and Drug Administration evaluation of the safety and effectiveness of a third dose, the officials said.

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