I am very much in the learning process when it comes to pigeon diseases. If you have any questions, ask a local fancier that has been raising pigeons for a while. However, I did come across the below website and thought it was pretty good.
Keep in mind, where it mentions Paramyxovirus, the vaccine is now available in the United States as well. Most pigeon clubs will require you to vaccinate your birds before a show or a race. It is a good idea to do so even if you do not plan to show or race your pigeons.