Outbreak network. Network showing the individuals and poultry involved in the outbreak and the links identified between them. The network contains 254 individuals, (including 2 cases in poultry (squares), 14 human cases, and 72 other individuals from whom contact tracing was carried out). Cases and links between cases are shown in red. Those other individuals from whom contact tracing was carried out and their links to cases are shown in blue. Other individuals and links are shown in grey.