(Nitrouma) is very similar to all hemorrhagic fever diseases.. It is from the same species, but (Nitrouma) appears to be a protozoan virus! He's not good at showcasing! Hemorrhagic fever diseases like to disturb and bleed from all orifices of the body. As for Nitroma, he is an aristocratic creature who likes to work in silence and kills his victims without noise. The only easy solution for the authorities at that time was denial, or claiming its non-existence, but unfortunately that did not answer the many question marks that drowned the events...