U.S. health authorities on Tuesday called for a pause in the use of Johnson & Johnson's coronavirus vaccine, citing cases of a "rare and severe type of blood clot" in individuals who had recently received the shot.Following the announcement, the major U.S. pharmaceutical company said it has decided to "proactively delay" the rollout of its vaccine in Europe.More than 6.8 million doses of the J&J vaccine have been administered in the United States as of Monday, of which six cases of such blood clots were reported among women between the ages of 18 and 48, the U.S. Food and Drug Administratio…READ FULL ARTICLE