Measles is one of the most infectious diseases known, with a significant morbidity and mortality, especially in the malnourished. The main features of five cases are demonstrated and treatment discussed. Then seven cases of chickenpox (Varicella) are shown, ranging from a trivial illness in young children to severe disseminated chickenpox in adults. This is followed by a discussion of many of the issues relating to immunisation, and important aspects of treatment. Finally, Dr Heath presents a child with a streptococcal rash, who has also had meningococcal septicaemia; and in the context of this child and another case discusses classical Scarlet Fever, as well as meningococcal disease and its early recognition. This film gets close to giving the viewer real clinical experience of these classical and preventable infectious diseases.