The outbreak of diseases occurs at different levels. The way they occur determines how seriously they are taken and how they are categorized. For instance, there are many types of diseases in the world today, with most being managed properly and not posing a serious risk to the world. There are several modes through which diseases can be transmitted, hence, the presence of air-borne diseases and water-borne diseases among others.
The way the disease spreads and how they can be contracted goes a long way to determine if it is a serious risk to the world or not. Furthermore, the availability of vaccines and medications as well as the chances of survival are also very crucial factors in determining if it is a high-risk disease or not.