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I know you weren't asking me, but I think that the body can defend itself and make antibodies against more than one virus at a time. If I remember correctly, the CDC was saying that there MAY be some assist against the Fujiian strain from the Panama vaccine. Of course, they could be wrong, too...

Sometimes in an antigenic drift situation, the immunological response makes immunity toward the disease first encountered and cannot recognize the new infection. If the Panama/Fujian situation is such, then we are in deep...well you know. The body can make antibody toward several diseases at the same time, only if it recognizes them.

From tomorrow's MMWR"

For the weeks ending October 4–December 6, WHO and NREVSS collaborating laboratories in the United States tested 24,906 respiratory specimens for influenza viruses; 6,751(27.1%) were positive. During the same period, the weekly percentages of respiratory specimens testing positive for influenza viruses increased from 1.4% to 37.1%. During the 2000–01, 2001–02, and 2002–03 influenza seasons, the peak percentages of specimens testing positive for influenza ranged from 23.2% to 26.4%. During the 1999–00 influenza season, when influenza A (H3N2) viruses predominated, the peak weekly percentage of specimens testing positive was 30.9%(1; CDC, unpublished data, 2003). Of the 6,751 positive isolates, 6,716 (99.5%) were influ-enza A viruses, and 35 (0.5%) were influenza B viruses. Ofthe 6,716 influenza A viruses, 1,255 (18.7%) have been subtyped; 1,254 (99.9%) were influenza A (H3N2) viruses, and one (0.1%) was an influenza A (H1) virus. As of Decem-ber 6, a total of 47 states and all nine surveillance regions had reported laboratory-confirmed influenza. CDC has characterized antigenically 215 influenza viruses that were collected and submitted by U.S. laboratories since
October 1. Of these, 212 were influenza A (H3N2) viruses,
and one was an influenza A (H1) virus. Of the 212 influ-enza
A (H3N2) viruses, 54 (25%) were similar antigenically
to the vaccine strain A/Panama/2007/99 (H3N2), which is
contained in this season’s vaccine, whereas 158 (75%) were
similar antigenically to A/Fujian/411/2002, a drift variant
of A/Panama/2007/99.