AFP: US approves first vaccine against chikungunya virus: drug regulator. #health
I never heard of it either. Here you go: https://www.cdc.gov/chikungunya/
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It's a very nasty disease prevalent in areas where the type of mosquito that carries it is present, spread by mozzies - it's called break back fever as it causes dreadful back and joint pain which can persist for months. It is however rarely fatal.
@Paulos_the_fog Sounds awful though.