These agents usually kill the victims within a day or two after it has come into contact with its host. Surprisingly enough, starting cultures for these microorganisms are easily found in most areas. These weapons are effective because the particles remain suspended in the atmosphere for a long enough period of time to infect large numbers of people. Whenever these weapons are used, they have to decide how the weapons will arrive at their target. Countries using these weapons use missiles to deliver the microorganisms.
Terrorism is probably the factor that is the key to the beginning of the next war.
Small nations, even subnational terrorist groups have the ability to inflict mass destruction upon their enemies. One such group is Osama bin Laden's terrorist group who has enough money to support his actions. This group also asks countries to house his group. The U.S. has acknowledged that some countries suspected of pursuing biological warfare programs are known sponsors of terrorism. One such terrorist act that could have been worse was the bombing at the World Trade Center in New York.