Letter to the editor: Chikungunya infection in travellers to Thailand: additional United Kingdom cases identified by specialist laboratory MacGregor, Kirsten and Buckland-Merrett, Gemma and Bailey, Daniel and Aarons, Emma, Eurosurveillance, 24, 19-00333 (2019), https://doi.org/10.2807/1560-7917.ES.2019.24.24.19-00333