How long can Cholera bacteria survive in a dead host?
No, I don't think so. 

Mostly estuaries (brackish water) and marine biofilms on submerged surfaces are a reservoir for Vibrio cholerae. Vibrio cholerae is isolated from rivers, creeks, washes, irrigation ditches, hulls of ships, etc. (Indeed, cholera spread rapidly throughout the world after the 1817 epidemic, largely due to the inadvertent transport of contaminated bilge water, mainly from British ships.)


  Transmission is by the fecal–oral route. Infections are particularly common after ingesting contaminated water or food. Cases are occasionally seen in people who have eaten raw or undercooked shellfish, particularly oysters, from contaminated waters. V. cholerae is excreted in the feces and vomitus. Viable organisms can be found in feces for up to 50 days, on glass for up to a month, on coins for a week, in soil or dust for up to 16 days and on fingertips for 1 to 2 hours. Bacteria survive well in water and may remain viable in shellfish, algae or plankton in coastal regions.


In 1855, a wave of cholera hit London. Thousands became ill and died before John Snow identified the Broad Street water pump as the single point source of that outbreak. Today, patrons of the John Snow Pub (built on the site) can enjoy local ale, and more importantly, a glass of crystal clear, pathogen-free water.


  V. cholerae [is] an autochthonous aquatic bacterium rather than a human pathogen that is a transient resident of the aquatic environment. V. cholerae has over 200 serogroups, with O1 and O139 being the causative agents of cholera, due to their carriage of the genes encoding cholera toxin (CT) and the toxin co-regulated pilus. ...[A]ssociations with the human host is only one small aspect of the V. cholerae life cycle and is not necessary for environmental persistence. ...[T]his bacterium is a cosmopolitan aquatic species that is capable of causing illness in humans.


Vibrio cholerae attachment is mediated by pili, which promote surface attachment and subsequent biofilm formation. It is rather difficult to believe that an aquatic biofilm was preserved on the hill for all those years, even in a dormant stage.


  ...they could transform into a unique dormant stage that was able to survive for months in the sediment of the estuary. ...These exciting new data enabled investigators to now integrate information regarding the seasonal nature of events surrounding an outbreak in populations living near estuaries.


I have found nowhere that the dormant stage can occur outside of water.

Environmental reservoirs and mechanisms of persistence of Vibrio cholerae

Medical Ecology Main Page   

Cholera  

 Something goofy going on with these, sorry.