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Samples testing PCR positive for Babesia in (a) 2015 and (b) January–March 2016. The red dots in (b) indicate the locations of owners expressing concern about UK risk of Babesia infection in February–March 2016. The red asterisk indicates the Chelmsford postcode area, the location of the initial outbreak (Swainsbury and others 2016). The yellow areas indicate postcode areas from which no diagnostic samples were received from participating laboratories during the study period
