Yeah. I've played Plague Inc for many years. It not a truly realistic simulation, it's a game, but as I read the news it's
1 airborne. I have many times slain all humaity with just this vector in a virus due to high mutation chance alone.
2 animalborne. This vector can be worst because the carrier animal may very well be asymptomatic and carry for life and shortly after death. Viruses with this vector are fucking horrible because of increased chance of mutation as it passes through novel animal systems and overcomes immune systems. I think this one is in play if a rumour I heard that China is encouraging pet euthanasia.
3 surface tenacity. Lysol or alcohol work fine for coron virus sanitizer, but unsanitized surfaces may remain infectious long after the water from a sneeze on a table, say, has dried up and become basically imperceptible. Resisting dessication for a time makes all the difference.
4 long gestation time before symptom presentation, and symptom presentation that starts like common nuisance illnesses. This is the killer. This factor is pretty much the whole Plague Inc strategy. Spread before detection, be hard to confirm, be hard to safely study to prevent cure.
Virus is a fun model to play, but I prefer carnivorous fungus. Spores are amazingly durable vectors.