Relief, eager anticipation for many Americans ahead of FDA decision on booster shots Wednesday, October 20 by ABC News(NEW YORK) -- For Mitchell Kronenberg, answers on the Johnson & Johnson vaccine can't come soon enough.A 42-year-old dad living outside Charlotte, North Carolina, Kronenberg enrolled in a clinical trial for the single-dose vaccine and got his shot last January. Since then, he's been patiently... Read More.