What we know is that there is no treatment or vaccine for the disease. I was reading an article this week reporting that the U.S. Department of Agriculture—or was it an expert—is not expecting a vaccine to be available for at least five or six years. The challenge is that we are dealing with a DNA virus, which is therefore very complex. As for the other countries, I cannot tell you whether or not they have intensified their research in recent months, but they have not yet found a cure or vaccine, probably because of the complexity of the virus and the disease.
On May 28th, 2019. See this statement in context.