President Biden announced his administration would begin offering booster shots for all Americans beginning the week of Sept. 20 pending approval from the FDA. Americans were told they should plan to get a third shot eight months after they received their second dose of Pfizer-BioNTech or Moderna vaccine. Top federal health officials have warned the White House that the Biden administration’s plan to begin offering booster shots to most Americans later this month may have to be limited initially, with third shots made available only to people who had received the Pfizer-BioNTech vaccine. Janet Woodcock, acting commissioner of the Food and Drug Administration, and Rochelle Walensky, director of the Centers for Disease Control and Prevention, told White House coronavirus coordinator Jeff Zients on Thursday that their agencies may not be able to approve a more expansive coronavirus booster plan that they, along with other top doctors across the administration, endorsed last month. If the Moderna vaccine is not approved, it will not be available for a booster vaccine clinic in September as I previously suggested.