Abstract
During 1967, 37 patients in an urban general practice were diagnosed as having Mycoplasma pneumoniae infections giving a minimum attack rate of 1.1 per cent. Their varied clinical picture is described, along with the radiographic and haematological findings. Data relating to family infection is presented and the importance of the early school age child in relation to the spread of this infection is stressed. It is suggested that this infection is a ‘general practice illness’ with a low hospital component.