Chikungunya
Since 2005, chikungunya has become much more common.  It has caused large outbreaks in Africa, Asia, and the Americas.  For example, in India, chikungunya re-appeared after 32 years where no Indian person had gotten the virus.  Outbreaks have also happened in Europe, the Caribbean, and South America, where chikungunya had never spread before.  A few people have also gotten chikungunya in the United States and Australia, where the virus had never lived before.