Biden's Covid booster shot plan mired in confusion amid regulatory hold-ups

The Biden administration’s plans to widely administer Covid-19 vaccine booster shots later this month have become mired in confusion over regulatory approvals, eligibility and logistics, in the latest blow to its efforts to curb the pandemic. US health officials announced last month that they planned to start offering Americans another round of Covid jabs from September 20, following evidence that the effectiveness of some vaccines starts to wane after a few months.