Pertaining to the swine flu, the live virus is attenuated and is used in the nasal spray where as the deadened virus is used in the actual shot given to older people taking the vaccine. The live virus is not actually more dangerous because it is attenuated and not intended to get the recipient sick but to provoke the immune system and to engage it in antibody production. The deadened virus is actually a more potent version of the vaccine.
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