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The death rate from the Haiti cholera epidemic that has killed more than 7,000 people over the past two years has finally ebbed, but the debate about the source of the disease has only grown more heated. 
That renewed controversy came into sharp focus following the recent release of a study led by a University of Maryland cholera expert renowned in the scientific community.
Challenging prevailing wisdom, the study found that Haiti had not only  just one cholera strain but a second one that may have been lurking undetected prior to the arrival of a United Nations peacekeeping battalion from Nepal.
Many finger the battalion as the chief culprit for a disease that has sickened more than half a million people.
The study fell short of explicitly blaming the epidemic on the newly discovered strain but said it was a factor. 
It was enough to reignite discussion about the disease and heighten political tensions between two camps who have argued over whether it was humans or the environment that could've introduced cholera to Haiti.