How come cholera fears hardly ever materialise after natural disaster?

Where getting info?: Lots of factors to consider here, but cholera outbreaks often depend upon the affected area's remoteness ; sanitation, rapidity ; coordination of relief response, underlying age, health, prosperity and preparedness of the local population, climate/season of the disaster, as well as kind ; extent of the calamity in question. Of course, there is never such thing as a good disaster.

Sanitation: Cholera is spread if it is endemic and then there is contamination of the water supply. This is more likely to occur in countries that have weak infrastructure, and less likely in developed countries that have better disaster response.

Cholera isn't gone.: After floods in Bangladesh in 2004 there were > 17,000 cases of diarrheal diseases to include Vibrio cholera & E coli. After flooding in West Bengal in 1998 there was a cholera epidemic with > 16,000 cases. A cholera epidemic 9 months after the 2010 Haiti earthquake effected at least 4,722 with 303 deaths. There were documented Cholera cases after Hurricane Allison in 2001 & Hurricane Katrina in