"Everyone is very aware of the fact that Ramadan begins next month and that there will be a large, large movement of people in a small crowded spaces," said Gregory Hartl, a spokesman for the WHO. "So the more we know about this virus before that starts the better."There are also concerns that tourists could bring the virus back to their home countries. It appears to have an incubation period of up to 12 days and a fatality rate of 60 per cent. . . There are currently no known treatments. Margaret Chan, WHO director-general, previously called MERS a “threat to the entire world”.