flu scareEverything swine and dandy?This intriguing notice posted to the International Society for Infectious Diseases by Columbia University researchers suggests that the current swine flu outbreak may be a “reassortment” (i.e. rearrangement) of existing swine flu viruses and not a swine, avian, and human influenza combo:

The preliminary analysis using all the sequences in public databases (NCBI) suggests that all segments are of swine origin. NA and MP seem related to Asian/European swine and the rest to North American swine (H1N2 and H3N2 swine viruses isolated since 1998). There is also interesting substratification between these groups, suggesting a multiple reassortment. We are puzzled about sources of information that affirm that the virus is a reassortment of avian, human and swine viruses. It is true that the H3N2 swine virus from 1998 and 1999 is a triple reassortant, but all the related isolates are found since then in swine.

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We’ll see if this analysis holds up and it certainly doesn’t guarantee that the outbreak will be any easier to contain, but it does suggest that the current flu — at the moment — is not the triple-threat that it was reported to be. Stay tuned…

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