Guest Editorial Special Issue on Fighting Against COVID-19

This is the introductory manuscript for the Special Issue on Fighting Against COVID-19. In this, the guest editors commenters all the accepted manuscripts for publication, presenting them grouped on four main subtopics: (I) COVID-19 dissemination modeling; (II) follow up of social isolation; (III) artificial intelligence and deep learning applied to COVID-19 diagnosis; and (IV) different technological developments on fighting COVID-19.