LONDON (AP) — Leaders of the Group of Seven economic powers have promised to immunize the world’s neediest people against the coronavirus by giving money and precious vaccine doses to a U.N.-backed vaccine distribution effort. But the leaders are also under pressure over the pace of their vaccination campaigns at home, and they didn’t say exactly how much they were willing to share with the developing world, or when. Chancellor Angela Merkel said after the G-7 leaders met Friday that “no vaccination appointment in Germany is going to be endangered” by sending vaccines abroad. Wealthy nations have snapped up hundreds of millions of vaccine doses, while some countries in the developing world have little or none.