Doctor Emanuil Ceausu , head of Bucharest 's Victor Babes hospital for infectious diseases , said the epidemic had been caused by a virus yet to be identified .
<response> Doctor <person>Emanuil Ceausu</person> , head of <location>Bucharest</location> 's <location>Victor Babes</location> hospital for infectious diseases , said the epidemic had been caused by a virus yet to be identified . </response>