Have you guys ever noticed that itachi and kimimaro had the same disease as orochimaru ? My theory is that orochimaru was experimenting with his body and accidentally contracted a virus from it . He didn't know about the
Virus so he experimented on kimi the same way and he contracted it
As well. Then , I believe he either gave it to itachi by sneaking it
To him or itachi actually contracted it from oros snake . I believe oro gave it to itachi and no one
Else because itachis immune system probably take
Hit from repeated sharingan tsukoyomi uses therefore rendering him more likely to obtain the disease. Also , itachi put oro under genjutsu with his sharingan as oro had a snake wrapped around him so itachi more than likely weakened his body temporarily to
The point where oro gave him the disease .
What do you