The handbook summarises the key features of infectious diseases of public health importance and their management. In this latest version, updated in 2020, new information has been added and updated where necessary so that the most up to date summary for each disease is presented. In addition, a number of new diseases of public health importance have been added including Middle East Respiratory Syndrome (MERS), Severe Fever with Thrombocytopaenia Syndrome (SFTS), Monkeypox, Zika virus infections and COVID-19.