In the race to vaccinate against Covid-19, willing adults in some states may be waiting all year

President Joe Biden said Tuesday that he expected all states to open Covid-19 vaccine eligibility to all adults by April 19, and at the current pace of vaccination — about 3 million doses administered each day — every adult in the United States could be vaccinated by mid-summer.President Joe Biden said Tuesday that he expected all states to open Covid-19 vaccine eligibility to all adults by April 19, and at the current pace of vaccination — about 3 million doses administered each day — every adult in the United States could be vaccinated by mid-summer.