The COVID-19 vaccine is almost nowhere in the developing world. While countries can't obtain a single dose of the vaccine, rich nations have vaccinated their citizens at a rate of one person per second over the last month.

With vaccines available to every adult in the US as of April 19th, 2021, a new problem surfaced: how will vaccinated people prove their status?

Nearly 7 million people in the US received a single dose of the Johnson & Johnson vaccine. Dr. Janet Woodcock, the acting commissioner of the F.D.A. says the pause will only last a few days, although this time frame depends on what we learn in the next few days.