Dr. Begely: hum… it still infected. That means it must be a retrovirus or RNA virus, which are the same thing.
Real Video(.rm)

Dr. Shelly: No… RNA viruses and retroviruses are different things. I think it's an RNA virus.
Real Video(.rm)

What type of virus is it? RNA, DNA, or retroviruses?

 Yup yup… I think it's the DNA virus.

 There is no doubt that it's a RNA virus!

 It must be either retroviruses or RNA viruses.

 It must be those retroviruses.