Hmmm. The Trivalent Inactivated Vaccine (TIV) is the only type of flu vaccine that has been offered for the seasonal vaccination programmes since at least the mid 70s. Use of a Live Attenuated Influenza Vaccine (LAIV) is only used for a very specific set of recipients, principally because of the risk of transmission, the difficulties in the logistics and storage (it has to be stored at -15degrees C), and cost. Use of LAIV has always been confined to an intranasal spray - flumist in the US and fluenz in the UK.
http://www.cdc.gov/fl.../vaccine/vaccines.htm
As to Scarletts post - cannot comment on specifics, except to say that it should be considered impossible for an inactivated vaccine to infect a recipient with flu.So, if Scarlett had received the flu vaccine intramuscularly, then it would have been the TIV, and it is impossible for an inactivated vaccine to transmit the flu. A more likely scenario is that Scarlett was already infected at the time of the vaccination.
As to the value of the flu vaccination - it has a place for those within the population at a higher risk of contracting the infection or suffering more as a consequence of becoming infected. On balance, if you are offered the vaccination, I would recommend it - but its your choice :)