By Natalie Grover and Jennifer Rigby LONDON (Reuters) – Health officials in Europe are discussing whether to follow a move by the United States to stretch out scarce monkeypox vaccine supplies, with the World Health Organization calling for more data. There have been 27,800 monkeypox cases – largely among men who have sex with men – and 12 deaths worldwide this year. Supplies of the key Bavarian Nordic shot, the only vaccine authorized to prevent monkeypox and a key part of the global public health response, are scarce, according to WHO and other government health agencies. On Tuesday, the U.S…