I remember learning in mesechet Taanis that if there is a plague in the city with a certain number of people and there are people dying daily that the city should declare a fast. Is there any contemporary application of this? For example if there is, God forbid, a community where there are cases of Ebola reported and people are dying is there an obligation for that community to declare a fast?

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    judaism.stackexchange.com/a/47475/759 Don't ever ever ever fast if it compromises your ability to fight off a local infectious disease. – Double AA Oct 29 '14 at 18:37
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    @DoubleAA that determination should be made by competent (and God fearing) medical expert in conjunction with a Rabbi I assume. I am asking the question theoretically in any case – user6641 Oct 29 '14 at 19:02
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    Ebola is not spread by casual contact, and even then only by people with symptoms (CDC). So merely being in the same city as a few Ebola victims does not present a serious danger, assuming appropriate precautions are being taken ("the risk of an outbreak in the U.S. is very low"). – Ypnypn Oct 29 '14 at 21:12
  • 5tjt.com/ebola-a-halachic-perspective – user6641 Oct 30 '14 at 13:13

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