What is the fine-grained topic of the following text: According to the Ellesmere Port Pioneer, Kathleen Gilmovitch was one of around 200 visitors to a holiday camp managed by Butlin's in Bognor Regis to be affected by an outbreak of the norovirus bug earlier this month. Only return the topic.
Norovirus outbreak at Butlin's holiday camp in Bognor Regis