senior epidemiologist matthew griffith is a technical adviser who has been analyzing epidemics and advdvising the japanese officials. he said d the virus is a a movi target, making it difficult to collect information on it, and treat people at t e same time. >> nobody's had to deal with this situation before. it is a new corononavirusus aew virus on board a ship with 4,000 people. and there arere no guidelines f that. there are noo prioror experienc fo that. >> criticism has been building both in japan and internationally. some medical experts have questioned whether the diamond princess should have been quarantined for two weeks after arriving in yokohama. the national institute of infectious diseases reported that the new coronavirus continued to spread on board even after the passengers were told to stay in their cabins as a quarantine measure. griffith said quite a few passengers were likely infected before the measures were enacted. >> s so prior to arrrriving in yoyokohama, there was an increa in the number of phone calls to the clinic or visits t to the clinic on n the ship specifical