new vaccine strategy

[gsgs]

http://www.ft.com/cms/s/0/2b5ea228-e1b4-11dc-a302-0000779fd2ac.html

... publish scientific data showing that Novartis' H5 vaccine stimulates rapid protection
with a second booster jab against pandemic flu strains for at least seven years.
.. a single flu vaccine shot would normally only offer protection after four to six weeks,
but an initial jab would allow a subsequent booster to become effective within two to three days.

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I assume they mean the time frame for the 2nd booster shot is 7 years ?
While after that booster shot immunity builds up quickly after 2-3 days
and lasts half a year as for seasonal vaccine ?

They might use that booster-strategy for seasonal flu too ?