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It takes time to isolate the virus causing the disease and then to capture it and make it reproduce rapidly in a laboratory to enable the development of a vaccine.

Some strains that are captured and tried may not "grow" well and then a different strain needs to be found to use instead. The medium to carry the viral particles to enable inoculation of flu vaccines does not need to be redeveloped for every type of virus grown, and the testing of the medium does not have to be redone for each annual vaccine that is developed. So, in that aspect of drug manufacturing and testing, the new flu vaccines can be developed much more rapidly than other types of medicines and brought to market faster since the testing of the medium doesn't need to be redone each time.

It was actually astonishing how fast the new vaccine for the pandemic Swine Flu made it to the end user patient, actually. They were very lucky to find the right strain that would grow easily and reproduce especially quickly to enable the vaccine to get to market even sooner than originally anticipated and in time for the 2009-2010 flu season after the start of the pandemic.

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Q: Why can't a vaccine be developed straight away when you have the Swine Flu?
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