A vaccine will still have to go through the three phases of Clinical Trials, it's just that there will be more hospitals will be involved, and that the data will be collected more quickly.
The first phase is basically human tolerance, and occurs in specialist units, where the drug/vaccine is administered to "healthy volunteers" (i.e. people without the condition). Often this is a relatively small group, and will be remembered for the testing of Fialuridine in 2006, which at a concentration of 0.002% of that administered in animal safety tests resulted in the deaths of four of the volunteers.
Phase 2 is where the drug is administered in similar controlled units, but to patients with the condition (for drugs, slightly different for vaccines, where they look for creation of antibodies). Once proven safe and efficacious in Phase 2, they move onto Phase 3 where the drug is administered to a large population (small thousands).
I for one will not be holding back in being vaccinated... It's a bit like the current upsurge in mumps and measles due to the false research done by Dr Andrew Wakefield who was subsequently struck off. MMR are much more serious diseases in adults, and there are teenagers currently suffering from that because of the continuing acceptance of the false research which was subsequently disproved by a huge study in 2008.