[\'Initiator and coordinator of the study, Hamburg, Germany. Electronic address: arentz-hamburg@web.de.\', \'Applied Physicist Optics and Spectroscopy, Neritz, Germany.\']
Evaluation of methylene blue based photodynamic inactivation (PDI) against intracellular B-CoV and SARS-CoV2 viruses under different light sources in vitro as a basis for new local treatment strategies in the early phase of a Covid19 infection.