Does anyone know if there was a cholera epidemic between 1850 and 1857 in Clay county,specifically Liberty? My ggg-grandmother Hannah Campbell and their eldest son Adam appear on the 1850 census but not on the 1860. I've located the other children who would have been of age to leave and start their own families. Adam is listed under the category "deaf & dumb,blind,idiotic" etc. My ggg-grandfather had remarried in 1857. I read that many times the deceased were buried in mass graves. Any suggestions?