Authors’ response: Chikungunya infection in travellers to Thailand: additional United Kingdom cases identified by specialist laboratory Javelle, Emilie and Hamer, Davidson H and Field, Vanessa and Jmor, Shilan and Gautret, Philippe, Eurosurveillance, 24, 1900367 (2019), https://doi.org/10.2807/1560-7917.ES.2019.24.24.1900367