Top health officials in the Biden administration may recommend most Americans get Covid booster shots eight months after becoming fully vaccinated. The plan would involve administering third shots beginning in mid-to-late September, pending the U.S. Food and Drug Administration authorization. Pfizer and BioNTech said Monday that the companies had submitted initial data to the FDA, and the plan could be announced as soon as this week. Last week, the FDA authorized third doses for immunocompromised people, and the U.S. Centers for Disease Control and Prevention almost immediately recommended those doses. Health care workers, nursing home patients, and older populations will again be the first to receive shots. Officials are still gathering data for Johnson & Johnson's one-shot vaccine.