Figure 2. Distribution of clinical Camplylobacter jejuni isolates from Denmark over time, 2015–2017. Colors represent isolates in large (>5 isolates, n = 176) and small (2–4 isolates, n = 190) clusters or as sporadic cases (n = 408). All 774 clinical isolates are shown according to their sample date. A higher concentration of clusters occurred during the summer, and the number of sporadic cases was relatively constant during the year.