On the discovery of the nature of cholera toxin in India.

This brief account looks at the discovery of the nature of cholera toxin in India. During the late nineteenth and early twentieth centuries research on cholera was being carried out in Bombay and Calcutta. Robert Koch visited India in 1883 and isolated and purified vibrio cholera the following year.This paper considers the contribution of Dr Sambhu Nath De, known best as S. N. De, (1915-1985) to cholera toxin discovery and notes the 2009 Conference which honoured his memory.