Declan Butler
ddobbs | April 30, 2009Nature's Declan Butler looks at how baffled virologists are as they examine this virus's DNA:
Researchers are scrambling to study the evolution and spread of the novel H1N1 strain of swine influenza whose leap to humans was officially confirmed last week....
The genetic make-up of this swine flu virus is unlike any that researchers have seen. It is an H1N1 strain that combines a triple assortment first identified in 1998 â including human, swine and avian influenza â with two new pig H3N2 virus genes from Eurasia, themselves of recent human origin.
"It has been mixing all over the place,…