Emergence of viral agents in Europe is influenced by various factors. Climatic changes influencing possible vectors, insufficient vaccination, and travel of man and goods are among the most important reasons to explain these changes. Fever and arthralgia are the leading symptoms in infection with Dengue, Sindbis, or Chikungunya virus. In contrast, tick-born encephalitis (TBE), Toscana, or West Nile virus infections mainly lead to meningo-encephalitis. In Europe, hemorrhagic fever is caused by Crimean Congo and Hanta virus. Protective vaccines are available for emerging viral agents like TBE, influenza and measles.
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