As China attempts to contain the spread of a new coronavirus that has left more than 100 people dead, rumors and disinformation have spread amid the scramble for answers. Some of the speculation has centered on a virology institute in Wuhan, the city where the outbreak began. One fringe theory holds that the disaster could be the accidental result of biological weapons research. But in conversations with The Washington Post, experts rejected the idea that the virus could be man-made. “Based on the virus genome and properties there is no indication whatsoever that it was an engineered virus,” said Richard...