Kentaro Iwata, an infectious diseases expert at Kobe University who visited the ship, strongly criticised the management of the situation in two widely circulated YouTube videos published on 18 February.[36][37][38][39] He called Diamond Princess a "COVID-19 mill".[40] He said that the areas possibly contaminated by the virus were not in any way separated from virus-free areas, there were numerous lapses in infection control measures, and that there was no professional in charge of infection prevention—the bureaucrats were in charge of everything.[41] Japanese officials denied the accusations.[42][41] While the U.S. Centers for Disease Control and Prevention commended the efforts to institute quarantine measures, their assessment was that it may have not been sufficient to prevent transmission among people on the ship.[43][44] Anthony Fauci, director of the U.S. National Institute of Allergy and Infectious Diseases, said that the quarantine process had failed.[38] A day later, Yoshihiro Takayama, an acquaintance of Iwata and a doctor working on Diamond Princess, pointed out what he described as errors in Iwata's description of the situation in a Facebook post that went viral.[45] The next day on 20 February, Iwata removed his videos and apologised to those involved, but still insisted the situation on the ship had been chaotic.[45][42]