What did the Prophet Muhammad (saw) say regarding no contagious diseases being conveyed without Allah's permission?
      Narrated Abu Huraira:                          The Prophet said, 'No 'Adha (i.e. no contagious disease is conveyed to     others without Allah's permission); nor (any evil omen m the month of)     Safar; nor Hama" A bedouin said, "O Allah's Apostle! What about the      camels which, when on the sand (desert) look like deers, but when a      mangy camel mixes with them they all get infected with mange?" On that     Allah s Apostle said, "Then who conveyed the (mange) disease to the      first (mangy)     camel?"