<p>Brighton, London, Birmingham and Manchester were endemic for gonorrhoea by persistently arising in clusters every six months for two years. The London area is enlarged to the top right to better illustrate endemic areas and clusters. Circles denote 33 clusters across 21 aggregate regions (1,137 MSOAs). Numbers next to clusters correspond to region names listed in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0195178#pone.0195178.s006" target="_blank">S1 Table</a>. All outbreak clusters are interpreted as significant at <i>p</i><0.05. Age, gender, ethnicity, and IMD were included covariates.</p
