Three epidemiologically distinct cases of listeriosis, one perinatal and two adult, presented in hospital over a three day period. Clinical signs were non-specific with pyrexia and respiratory distress. Diagnosis in all three was made by blood cultures. Such cases reflect the general increase in reporting of listeriosis and suggest that the condition is increasing in incidence in the community, most likely due to food contamination. Raw vegetables, milk, soft cheeses, pre-cooked and inadequately cooked meats have all been implicated. Regular public health inspection of foods and food storage facilities with increased public awareness of the hazards of inadequate cooking and storage of food are the most effective means of preventing listeriosis and its potentially disastrous consequences especially for pregnant women and immunosuppressed patients.