Beijing is preparing for a 100-day Olympic countdown, but there are calls for a boycott and the threat of a virus.

On Wednesday, Beijing will commemorate 100 days until the Winter Olympics, but boycott calls and a new coronavirus outbreak in China have cast a pall over preparations. The Chinese city will host the inaugural Summer and Winter Games in February, and the Olympic flame was greeted with a low-key ceremony last week as the major event approaches. In tightly controlled China, there was no hint of opposition, but a tiny group of activists halted the flame-lighting event in Greece, brandishing a Tibetan flag and a banner reading "no genocide." The organizers have not revealed how they plan to commemorate the…