It seems they have not only optimized the transmission (in Chinese labs, with NIAID and USAID money), but also manipulated the payload of the virus. And they were successful with covering their tracks, first with the wet market story, then the accidental release story, and later through the "it's just the flu" and "there is no virus" movements. Now they make sure the virus will run its course by attacking vaccines with "vaccines will change DNA", "vaccines contain fetuses" and "vaccines reduce fertility" stories.