Chemoprophylaxis can be done for all of the following infections, except:
Typhoid
Cholera
Meningitis
Diphtheria
Typhoid can be prevented by immunization not with chemoprophylaxis. But immunization does not give 100 per cent protection from Typhoid. Cholera, meningitis and diphtheria can be prevented using chemoprophylaxis. Ref: Park's Textbook of Preventive and Social Medicine, 19th Edition, Pages 106, 197