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Cholera has killed more than 8,300 Haitians and sickened more than 650,000 in the earthquake-ravaged country, the poorest in the Western Hemisphere, since it first reappeared in October 2010.

Forensic studies, including one ordered by the United Nations, have identified the culprit bacteria as an Asian strain imported to Haiti by Nepalese members of the United Nations peacekeeping force, known as the United Nations Stabilization Mission in Haiti, which was first authorized in 2004 and maintains about 8,700 soldiers and police officers there, drawn from more than three dozen member states. The forensic studies have also linked the spread of the cholera to a flawed sanitation system at the Nepalese peacekeeper base, which contaminated a tributary that feeds Haiti’s largest river, used by Haitians for drinking and bathing.

A new research led by Dr Kimberley Seed from the Tufts University School of Medicine provides the first evidence that bacteriophages – viruses that infect and replicate within bacteria – can acquire a wholly functional and adaptive immune system.

The study, published today in the journal Nature, finds that a viral predator of the cholera bacteria can steal the functional immune system of bacteria and use it against its bacterial host.

Developing phage therapy is particularly important because some bacteria, called superbugs, are resistant to most or all current antibiotics.