Pfizer and Moderna shots, based on mRNA technology, mostly have served wealthy nations. AstraZeneca and Johnson & Johnson vaccines are expected to fill the global gap.
Rare side effects cast cloud over vaccines much of the world desperately needs Christopher Rowland A doctor fills a syringe with the Indian version of the AstraZeneca coronavirus vaccine at a hospital in Kabul on Monday. (Rahmat Gul/AP) Concerns about blood clots associated with the AstraZeneca and Johnson & Johnson coronavirus vaccines are deepening worries that the shots may not soon reach developing nations, which are far behind rich countries in immunizations and lack widespread access to costlier alternatives. The rollout of the Pfizer and Moderna vaccines this year generated a surge of optimism in the United States and helped President Biden reap the political rewards of an accelerating schedule of immunizations.
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