Controversy was stirred among the public and at the Diet Wednesday, after an infectious disease expert posted a now-deleted video online in which he claimed to have seen inadequate anti-virus contamination measures on the Diamond Princess cruise ship.

In the YouTube clip posted late Tuesday, Kentaro Iwata, a professor at the infectious disease division of Kobe University Hospital, claimed he saw there was no clear separation of noncontaminated ¡°green zones¡± and potentially dangerous ¡°red zones¡± within the ship. ¡°The cruise ship was completely inadequate in terms of the infection control,¡± he can be heard saying in English in the video clip.

¡°I never had fear of getting infection myself, for Ebola, SARS, cholera because I know how to protect myself and how to protect others and how the infection control should be ... (but) I was so scared of getting COVID-19¡± inside the Diamond Princess, he said.