a) Bar charts showing percentage of low responders (62-500pg/ml) and high responders (>500pg/ml) by season in the UK and Malawi. In the UK, responses are shown for Autumn (Sept, Oct, Nov), Winter (Dec, Jan, Feb), Spring (Mar, Apr, May), Summer Jun, Jul, Aug). In Malawi, seasons are warm and rainy (Jan, Feb, Mar, Apr, May), cool and dry (Jun, Jul, Aug, Sep), hot and dry (Oct, Nov, Dec).
b) Box and whisker plots showing IFNγ responses to M.tb PPD in Malawi and the UK by season. (UK n=51, Malawi n=78).