Four people have been diagnosed with sepsis after eating at a luxury restaurant in Stockholm as part of a suspected listeria outbreak. Health authorities say at least 15 people have been treated or are under observation in hospital after dining at Coco & Carmen, a high-end venue in the Swedish capital's Östermalm district. Most of the dozens affected are not seriously ill, officials in Stockholm say, and so far none of those admitted to hospital have required intensive care. Infection tracing initially covered guests who ate at the restaurant between September 25 and 27 but has now expanded to include those who dined there on September 23 and 24. Those with ongoing symptoms are urged to visit a hospital emergency room for assessment. Coco & Carmen has temporarily closed while an investigation continues, emphasizing their commitment to food safety.