WASHINGTON, United States (AFP) — Johnson & Johnson said Thursday the US Food and Drug Administration had authorized an extension for the shelf life of its Covid-19 vaccine from three months to four-and-a-half months. The news comes as millions of doses of the single-shot vaccine, which is stored at refrigerator temperatures, were in danger of expiring and being tossed. “The decision is based on data from ongoing stability assessment studies,” the company said in a […]