Strange viruses have always been around but this century's global movement means that they are quickly spread to areas where the population has no immunity to them.

This has happened from the early days of exploration and was shown in the flu pandemic after the First World War (when troops returning from Europe spread the virus in the USA, resulting in more deaths that had happened during the fighting)

Scientist may be able to develop a vaccine for this one but it will keep on happening as they can only act retrospectively,