@ Doha "There are natural viruses (those not weaponized) that kill so fast when in the human population, there are questions as to how the virus is survives to be transmitted to another host."
To answer your question about viruses that kill off its hosts at a rate faster than they can spread. Some viruses can lay dormant in certain individuals and still be infectious. A good example is the herpes virus. An individual could be a carrier of the virus and never even know it because they never develop symptoms. However, they're still infectious and quite capable of spreading it around. Which is probably the biggest reason it's so widespread.
"There are natural viruses (those not weaponized) that kill so fast when in the human population, there are questions as to how the virus is survives to be transmitted to another host."
To answer your question about viruses that kill off its hosts at a rate faster than they can spread. Some viruses can lay dormant in certain individuals and still be infectious. A good example is the herpes virus. An individual could be a carrier of the virus and never even know it because they never develop symptoms. However, they're still infectious and quite capable of spreading it around. Which is probably the biggest reason it's so widespread.