1. (1) The injection of serum prepared especially against strains of typhoid bacilli strong in "O" and "Vi" antigens appeared during the epidemic at Singapore to be of value in the treatment of serious cases of typhoid fever, even at a comparatively late stage of the disease. The time for the routine use of such serum in treatment has perhaps not yet come, but strong indications for its use are severe toxaemia, or failure to improve with general treatment. 2. (2) The absence of eosinophil cells in a differential white blood count is of value in the diagnosis though it is not an absolute sign in either a negative or positive direction. 3. (3) Congenital immunity against typhoid fever appears to be powerful for several years of childhood, in Malaya and presumably elsewhere also. 4. (4) Compulsory inoculation is advocated as a public health measure of protection against typhoid fever in countries where the disease is endemic, but not earlier than the 5th year of age. c 1941