If the cholera toxin is present, the toxin binds to the dextran because its chemical structure is similar to the cholera toxin receptor (GM1) found on the surface of cells in a victim's gut.

A new technique developed by University of Central Florida (UCF) scientists could allow earthquake-relief workers to test water sources that could be contaminated with the cholera toxin.

Dr Nochi's mice really were protected. When he fed them cholera toxin, they did not get sick.