Fig. 3From: Impact of the COVID-19 pandemic on Bordetella pertussis infections in EnglandTotal number of oral fluid, PCR and serology B. Pertussis tests and percent positivity by age group from January 2014 to June 2021 in England. The section in grey represents when SARS-CoV-2 restrictions changed across England.*Â *Grey area represents when lockdown measures changed in EnglandBack to article page