Rich nations had vaccine options after AstraZeneca and J&J faced clot reports. Others may not have that luxury

It was nothing short of a miracle when it became clear that scientists had developed several effective vaccines against Covid-19 in less than a year. Announcements last week from European Union and British drug regulators finding a possible link between AstraZeneca’s Covid-19 shot and rare blood clots, however, have been a real low point in the pandemic.