CCDM 19th Edition sticks to a tried and tested structure, but with every chapter updated, and most benefitting from parallel updated by international experts, at both, CDC and WHO, priority has been given to ensuring global relevance. New disease variants have been included and some chapters have been fundamentally reworked. The 19th edition is a timely update to a milestone reference work that ensures the relevance and usefulness to every public health professional around the world.