This is an interesting article,
Overcoming a vexing problem in vaccine research
If a SARS patient drowns in his own immune respond, is it wise to boost immunity further by vaccination? If the immune system fails to drive off the disease immediately, it might just flood the lung with too much fluid early; an early onset of acute symptoms.
The disease progresses quicker.
There are different type of vaccines and very elaborate tests and trial, fortunately.
