For Ileana Benitez and Jeremy Young of Kensington, Md., approval of extra shots cannot come soon enough. Benitez, 41, had a kidney transplant in her 20s. Young, 43, was the donor. Even after getting the Johnson & Johnson vaccine in March, the couple avoids grocery stores and restaurants. And with school starting soon, they fear their 8-year-old daughter might bring the coronavirus home. “It would be such a difference,” Benitez said, to get an additional shot.