Science. Top ten most dangerous viruses in the world. Bird flu, Ebola and now Zika there seems to be news on a new dangerous virus almost .ILOVEYOU. The ILOVEYOU virus is considered one of the most virulent computer virus ever created and it s not hard to see why. Code Red. Code Red first surfaced on and was discovered by two eEye Digital Security employees. Melissa. Sasser. Zeus. Conficker. Stuxnet. Mydoom..