President Joe Biden’s efforts to counter the COVID-19 pandemic in his first 100 days in office were boosted by the ramp-up in the vaccination campaign, but they were also marred by missteps and miscommunications from public health officials.

Biden entered office intending to administer 100 million shots within his first 100 days. He ended up meeting that target by his 58th day. While administration officials called it an ambitious goal at the time, public health experts considered it too modest because the United States was already on track to meet it under former President Donald Trump. Biden then increased his goal to 200 million shots in 100 days, which the administration met with a week to spare.