The common cold has no cure. Scientists have been trying for centuries to find the cure, which would undoubtedly make our lives easier. However, the common cold has nothing on these 10 infectious diseases. The diseases are, for lack of a better word, so viral that there is a high percentage chance that you will die from the complications. Some of these diseases have vaccinations; some have preventive measures while others are simply deadly with little chance of survival. To be included on this list, the virus has to have been a major cause of death in history with ranking based on fatality rates and impact worldwide.
10. Smallpox
This variola virus had many forms and continues to be a required vaccination for many countries. Smallpox in its worse forms - hemorrhagic and flat - had the highest fatality rates with only a 10 percent or less chance of survival. Fortunately this disease has been the only one on this list to be completely eradicated from nature since it is only contagious through humans.
Image: Smallpox
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