The perfect deadly virus would have to be some sort of a time bomb virus. Everyone thinks it’s common flu and is spread to 90% of humans. Couple of years later

The perfect deadly virus would have to be some sort of a time bomb virus. Everyone thinks it’s common flu and is spread to 90% of humans. Couple of years later it undergoes metamorphosis and turns into lethal suffocating or heart attacks. It would be almost impossible to control this. Bio weapons are perhaps the nastiest of any weapon. Someone smart enough could make it in a lab and it could bring the entire globe to its knees.