Nutrition status surveys, which included the investigation of cholesterol, phospholipid and amylase activity levels, were conducted on school children of the 4 main racial groups between the ages of 7 and 15 years in Pretoria.
Phage-typing schemes have been devised for a number at salmonellae and have proved invaluable in the tracing of carriers. Examples are given of the use made of phage typing in epidemiological investigations in South Africa and elsewhere.
A brief survey is given of the nutritive value of milk as produced by the cow and the extent to which it is affected by the different treatments to which milk is subjected during processing, e.g. centrifugation, heating, homogenization and manufacturing to different products.