CHENNAI, July 15: The outbreak of cholera in the Korukkupet area of the city appears to be on the decline, with only four of the 22 persons admitted to the Communicable Diseases Hospital today hailing from the area. A total of 122 persons are now being treated at the hospital for cholera. Authorities said incidence of cholera at Korukkupet was high because of the insanitary conditions prevailing there.