The World Health Organization said Tuesday it has been looking into the possibility that the novel coronavirus can be transmitted by air, after international scientists urged the WHO to revise its guidelines for the virus.A WHO official said at a press conference that the risk of airborne transmission cannot be totally ruled out, especially in crowded, closed or poorly ventilated indoor settings, adding the organization will continue to explore all potential infection routes.Related coverage:Tokyo reports 75 new coronavirus infectionsREAD FULL ARTICLE