If something like SARS is able to completely paralyze modern health care system, I don't hold out much hope for an actual weaponized version of it.
What I'm talking about is a dozen guys injecting themselves with the disease, hop on a plane to the US, and start hanging out in places with large crowds.
Yes, and even if they developed the disease without any accidents, if the American health care system can't stop it, it would likely propogate itself back to where those guys came from, which would likely have much worse health care and epidemic disease containment infrastructure, and do a lot more damage than it did in the US on a per capita basis.
The problem with highly contagious bioweapon is unlike nuclear or chemical weapons. The very weapon itself, if it were at all effective, will come back to your side without even any theoretical uncertainty.
To prevent it, you must make the bioweapon so rapidly fatal, or so rapidly declining in its contagiousness, that its distribution is largely limited only to those who came into initial contact with the original vector. In that case it became effectively the same as a conventional weapon.
Either that or you must undertake to vaccinate all of your own side.
It would be nearly impossible to vaccinate all of your own side without the support of a modern, very well organized and technologically accomplished state. I doubt more than 10-15 countries in the world can even attempt to do it, and none of them are rogue states that might try this over more conventional form of pressure or attack. If any country were to try, It would also be nearly impossible to vaccinate your own side without giving the game away and alert everyone else to what you are about to do.
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