Chikungunya
Chikungunya (pronounced "chicken-GUN-yer") is an infection caused by the chikungunya virus.  It can cause joint pains that can last for weeks, months, or sometimes even years.  About 1 in every 1000 people who gets chikungunya dies.  People who are elderly or have other medical problems are most likely to die or get very sick from chikungunya.